The Marathon Brane

Sekiguchi Genetics

16 min read

Sekiguchi Genetics

A megacorporation and subsidiary of the Sekiguchi Group dedicated to advanced bioengineering — holding a practical monopoly on the biocybernetic Shell market through proprietary WEAVEworm technology, CRADLE manufacturing systems, and neural synchronization products.

What the source establishes — canon

Corporate identity and classification. Sekiguchi Genetics (abbreviated SekGen) is classified as a megacorporation in the Runners’ Guide, operating under the broader Sekiguchi Group. Its stated role is “advanced bioengineering, research, and development.” Its designated faction agent for Runner contact is Nona.1

Core product lines. SekGen’s operations span: cloneware; neural syncing; biological modifications including vision augmentation and epidermal reinforcement; and iteration on biocybernetic Shells.1 The company describes itself as a “trailblazer and industry leader in shell development.”2

Shell-market monopoly. SekGen holds “a practical monopoly on the SHELL market, from neural synchronization to the SHELLs themselves and the process for quickly manufacturing replacements.” As Shell technology spreads, SekGen faces rising competitive threats to this dominance. To counter competition, SekGen offers Runners willing to travel to Tau Ceti opportunities to profit in exchange for discoveries and data collected from Shell activity on a hostile alien world.1

WEAVEworm technology. WEAVEworms are SekGen’s proprietary class of manufactured cybernetic organisms central to the print assembly of biocybernetic humanoid Shell bodies. Each WEAVEworm phylum hosts a specifically programmed hierarchy of sub-worm colonies, working in tandem to craft a Shell to exact manufacturing, biological, and technological specifications. The result is described as making “a durable post-flesh existence possible.”2

SYNTHsilk. SYNTHsilk is the synthetic amalgamation of biological and manufactured materials WEAVEworms spin to thread the layers of a Shell’s biosynthetic systems — composed of lab-grown undifferentiated cells edited for enhancement and to remove abnormalities before integration into the worm “birthing” process. An unintended side effect of the WEAVEworm “hunger” system — the bioprogramming mechanism that drives worm threading — is that worms allowed to interact with incomplete or damaged programming will attempt to devour one another, creating a “status knot” requiring full dismantling of all knotted worms to prevent proprietary data corruption.3 SekGen explicitly condemns unauthorized shell printing and repair as “a rare, and typically illicit, subversion of best practices.”3

Shell print process. The Shell print order of operations proceeds: skeletal structure → nervous system → circulatory system → viscera and viscera support webbing → frontal/parietal cranial enclosure → semi-flexible skeletal structures → muscular system → integumentary system. The full process may take as long as eight hours. Neural housing, biosync, and memoratic layering are onlined in microfractional instances alongside every printing stage. SekGen claims “Best in Class” neural eject safety nets (rated 2872–2885 by the Earth Institute for Advancing Living) to guarantee more complete mental integrity during emergency Shell evacuation.4

WEAVEworm technological timeline. SekGen’s proprietary READ_ME node provides a dated timeline of worm-technology development:5

  • 2198 — EARTHworm (refuse processing)
  • 2212 — WAXworm (hazardous site inspection/maintenance)
  • 2235 — SEAworm and SPACEworm (deepwater and exoatmospheric)
  • 2433 — DEEPworm and WARPworm (deepwater and exoatmospheric upgrades)
  • 2687 — SILKworm s1 (single-path printing of pre-structured prosthetics)
  • 2690–2708 — SILKworm s1v2 through s2 (dual-path → multi-function → full-body prosthetics)
  • 2797–2809 — SILKworm s3 series through s3v9 (integrated biomarker printing, owner-paired DNA weave, synthetic bone weave, rapid advancement); all SILKworm series unified under new WEAVEworm product category in 2809
  • 2843–2884 — WEAVEworm p1 through p4 (reconstructive surgery on cybernetic bodies → multi-stage Shell printing → omni-wave Shell printing → weave repair integration in Shells)

CRADLE system. The CRADLE is a SekGen-manufactured Shell tech product classified as a “bio-cybernetic shell augmentation” component. A CRADLE houses, nurtures, breeds, and focuses dedicated WEAVEworm colonies programmed for its dedicated biomatic print processes. It is described as “vital to the creation, customization, and upkeep of a healthy, operational SHELL.” CRADLEs rely on CyberAcme sub-systems and neural support links for connectivity between CRADLE function, worm clusters, and each Shell’s central operations — this grants the Runner’s ONI direct access to CRADLE proprietary systems and opportunities for jailbreaking. Hardware developer: Sekiguchi Genetics. Software developer: co-venture between Sekiguchi Genetics and CyberAcme Systems. The Runners’ Guide notes that CyberAcme’s circumstances at Tau Ceti give it “unique control over Runner access to CRADLEs.”6

SIMbiont prototype. SekGen developed the SIMbiont — a biosynthetic prototype described in the Codex as created by “a different megacorporation.” Reconstructed code fragments from the SIMbiont show behavioral logic structured around family/foe identification and a hunger/grow cycle; ONI detected “hallmarks of a rudimentary cognitohazard” in the fragments and sanitized them out of an abundance of caution.7 A metabolic readout provided to Runners participating in trial SGT-P1-75706C206C6966 shows elevated hyper-dense blood glucose, neural toxicity risk, and “significantly elevated” ATP collapse risk — the latter exceeding deployment tolerances for disposable Shells in Earth-like atmospheres.8 SekGen’s biosynth engineering team thanked Runners for enabling SIMbiont iteration, noting that Earth and Mars regulatory limits on study size and “acceptable side effects” made the Tau Ceti field environment uniquely valuable: “We couldn’t dream of this kind of pilot study on Earth or Mars.”9

Pre-Expedition biosynthetic pet contract (Felini / KAAL1 / FELI protocols). In the Pre-Expedition period, UESC scientist Dr. Dylan Roberts contacted SekGen Senior Project Lead Dr. Oliwia Andrysiak about engineering companion pets for Tau Ceti IV colonists departing on the Marathon mission. Roberts noted that SekGen was already providing engineered “seeder” supplies for the voyage and proposed using those starters to produce synthetic companion frames on-colony. Andrysiak identified SekGen’s KAAL1 protocol (mapping relatable traits to synthetic frames to mimic companionship) as the furthest-along but unsuitable for internals, and proposed reusing its base frame. She also referenced FELI1 and FELI2 protocols — FELI2 improving frame flexibility and granular behavior modifiers — as a simpler approach.10

Andrysiak’s Felini deliverables specification (Pre-Expedition) outlined: granular behavioral nodes; class-D synth rules (hardcap on problem-solving and agency); unlimited recall enabling “delighter moments”; a normal feline skeletal chassis with heat venting via plate seams; “kindchenschema” facade design (round head, large eyes, small mouth). Fur posed challenges due to New Cascadia’s atmospheric moisture encouraging fungal growth; hypoallergenic shorthair was pursued after copper-infused synthetic hairs proved unpleasant and hairless variants received strongly negative user responses.11

By Q2 2787 (Colony Era), New Cascadia technicians were troubleshooting Felini manufacture on-colony. The neural specs SekGen provided in 2472 “simply don’t work as intended” — units operated for a day or two then bricked. Technician homebrew bypasses that skipped the inhibitor system produced unstable, potentially dangerous units (one unit dug 13 meters into mud and burned out, demonstrating output far exceeding safe design parameters). The team noted it would take ~24 years round-trip to contact SekGen HQ given light-speed communication delay.12

Traxus purchase orders (2888) — Japanese-language intercepts. The intercepted Sekiguchi internal email chain (2888年5月25–28日 / 25–28 May 2888 JST) documents a large-scale biomata purchase order from Traxus (PO 970224312, later also PO 910853457). These emails are predominantly in Japanese. Translations of key content follow; portions marked [JA-translated] are the vault’s own English rendering — produced with AI/LLM assistance, not a professional human translation — and should be treated as approximate; the original Japanese preserved verbatim in the Mirror is authoritative.

  • Iwasaki Kaito to Goto Mina [JA-translated]: A new biomata purchase order (PO 970224312) has arrived; given its scale it requires utmost care, both financially and to maintain the client partnership. Level-2-or-above security protocols required.13

  • Internal facilities: Toilet facilities on floor 149, NW block 41–60 were temporarily out of service due to pipe damage, then restored.14 15 (Internal ops only; no lore significance.)

  • Mirai.Assist reminder to Tamura Yoshito [JA-translated]: Reminder of the 2888 Traxus Illuminate Conference; Tamura had pre-registered for three panel discussions on cloning innovation.16

  • Traxus Global Security Commander Draža Kralj to Goto Mina (English): The attached PO document is encrypted; decryption keyword to be provided via direct contact through Mx Kiori meeting with Traxus representative. “This matter is strictly confidential and requires expedited service from Sekiguchi Genetics to meet necessary fulfillment and delivery needs.” Traxus Global Security to monitor PO through completion.17

  • Sakamoto Morio to Goto Mina [JA-translated]: Instructs production and manufacturing leads to mobilize for the Traxus urgent order (PO 910853457). Notes Traxus is SekGen’s largest customer in biomata and biomata support technology. Existing “birth” pod deliveries for other customers may be displaced; Traxus has approved this PO to take priority over others.18

  • Sato Yori to Goto Mina [JA-translated]: Raises concern about sharing new-model worms and nesting systems externally at this early stage. Acknowledges contractual confidentiality and reverse-engineering prohibition, but doubts SekGen could impose meaningful penalties on Traxus. Frames it as an advisory concern: releasing biomata support and “birth” technology risks losing exclusive proprietary ownership. Does not require a direct meeting.19

  • Goto Mina to Tamura Yoshito [JA-translated]: Provides codeword for connecting with the Traxus security operator: “100 97 101 100 97 108 117 115”.20

  • Sakamoto Morio to Goto Mina and Tamura Yoshito (English): Addendum to PO 970224312 attached. Notes inclusions of biomata types listed as IO; instructs that any concerns about “S-Series inclusion” be directed to his office — “this PO has full Board sign-off.”21

  • Hashimoto Kaemon to all SekGen staff [JA-translated]: Reports a collapse accident at Traxus’s Oxia Palus Operations B-01 site on Mars. 9 confirmed fatalities, 200+ injured. Notes that no workers who had neural-sync transferred to biomata were among the fatalities; many injured biomata workers survived because SekGen’s eject-catch system activated. Announces SekGen leadership approval of additional support for affected workers and replacement biomata for Traxus to enable shift continuity.22 23

  • Sakamoto Morio to Iwasaki Kaito [JA-translated]: Legal team reports UESC submitted an information security request to review PO 970224312, citing a 23 May 2888 inquiry. The PO is protected under “UESC v. TelaraTrax, Lmt., 943 MC 711 (2614)” without proper legal documentation. Legal team is handling it. Active message history related to the PO to be purged from active comms; archives retained by legal.24

  • Sakamoto Morio to Goto Mina and Tamura Yoshito [JA-translated]: PO 910853457 approved; production mobilized. Frames the Traxus partnership as “a first step toward deepening” the relationship, promising opportunities “on Earth, on Mars, and beyond.”25

  • Sano Teiji to all SekGen staff [JA-translated]: Announces the Traxus Space Industries partnership has been confirmed and extended, with new support and collaboration being explored. S-Series biomata pilot program underway. Details pending board approval.26

  • Sakamoto Morio to Tamura Yoshito [JA-translated]: Tamura being considered for promotion to management, to serve as liaison for the new dimensions of the Traxus partnership.27

Traxus supply-chain logistics (Traxus internal log). A Traxus internal chat log (LOG#00987) records logistics discussion about “Sekiguchi Gen cargo — Manifest ID SG-4521,” described as “critical.” A GPS tracking desync had caused a temporary loss of contact with the cargo during transit; the Traxus team was coordinating to re-establish contact and preparing a report to “keep Sekiguchi in the loop without causing alarm.”28

UESC intelligence assessment — named as secondary party. A classified UESC UE-Intelligence Division report (codename STARTING LINE) lists Sekiguchi Genetics as a secondary party in a multi-target threat assessment involving an infosec breach that compromised intelligence related to “PRO:GO” and its target. The report states that highly classified details were discovered by non-UESC operatives with intent to disseminate, including (but not limited to) anti-UESC activities and recruitment into the ranks of known and suspected anti-UESC groups — named alongside MIDA (primary) and Traxus OffWorld Industries (also secondary). The extent of each party’s role is described as “an active consideration.” Incident reports linked to SekGen include casefile614-4 (sekgen_comm_ir.rpt), casefile448-a (biomata_PO_discrep.rpt), and casefile5cf-0 (yoshito_t_invst.rpt).29

Runner mention of Sekiguchi diagnostics. In a Dire Marsh Night Runner chat log, Runner SL-82 asks whether “Sekiguchi is running some sort of diagnostic” to explain intermittent visual artifacts and HUD context errors around the Anomaly. No confirmation or denial is given within the log.30

Triage Shell — co-development with SEKGEN. The Runners’ Guide’s Triage Shell entry states that the medic-class Shell line, while first developed by Traxus for Martian mining, was “developed fully in concert with the UESC and SEKGEN” before becoming “a target of RUNNER interests shortly before they made their official debut.”31 This places Sekiguchi Genetics as a named co-architect of the Triage Shell — alongside its established roles as manufacturer of Shells generally and of the CRADLE hardware that prints them.

Thief Shell — in-house SEKGEN origin. The Runners’ Guide’s Thief Shell entry, by contrast, credits Sekiguchi Genetics as sole originator: “the first THIEF SHELL was an inside job — a specialized SHELL developed in-house at SEKGEN to serve in a raid of a rival corp.” The Runner hired for that job never returned the Shell, and its specifications “dropped on dark markets a few months later.” The entry adds that SekGen “were subject to a UESC probe in late 2885 just after a TRAX data breach, which is convenient, if nothing else” — implying a suspected connection between the Traxus breach and the Thief Shell’s leak, though the entry stops short of confirming one.32 The Thief Shell’s stock ICON personality series uses the “life-like facial replica and vocalization pattern of SEKGEN’s former lead SHELL Science Director, Dr. Yoki Samura” — chosen by the unknown Runner(s) who originated the persona for reasons the guide says remain theorized but unconfirmed.32

Cross-corpus appearances

VolumeSectionWhat it adds
SekGen OverviewRunners’ Guide — FactionsOfficial faction classification; Shell-market monopoly; Nona as agent
Code Fragments: SIMbiontFactions — Sekiguchi ContractsSIMbiont behavioral code; cognitohazard flag
Metabolic ReadoutFactions — Sekiguchi ContractsRunner metabolic data from SIMbiont trial; ATP collapse risk
Inter-Corp TransmissionFactions — Sekiguchi ContractsSIMbiont team gratitude; Tau Ceti as regulatory-free test environment
Matter, ConvertedLoot — CradleCRADLE product entry; CyberAcme co-venture; WEAVEworm colony housing
Pet Project CollaborationDire Marsh CollectiblesRoberts/Andrysiak comms; KAAL1 / FELI protocols; seeder supplies for Marathon
Felini DeliverablesDire Marsh CollectiblesFelini spec: behavioral nodes, chassis design, kindchenschema, fur challenges
Felini TroubleshootingDire Marsh CollectiblesColony Era manufacture failures; 2472 neural specs incompatible; comms delay to SekGen HQ
An Introduction to WEAVEwormsDire Marsh CollectiblesWEAVEworm function overview; proprietary technology description
An Introduction to SYNTHsilkDire Marsh CollectiblesSYNTHsilk composition; hunger system; status-knot warning
Shell Print Process OverviewDire Marsh CollectiblesPrint order of operations; 8-hour timetable; neural eject safety nets; Best-in-Class rating
WEAVEworm Technological TimelineDire Marsh CollectiblesDated development timeline 2198–2884
WEAVEworm AdvancementsDire Marsh CollectiblesLiving augmentation flexibility; UESC illegality of hardware subversion
Crew Chatter LogDire Marsh Night CollectiblesRunner query about possible SekGen diagnostic near the Anomaly
Intercept emails (×15 volumes)Intercepts — Sekiguchi EmailsTraxus PO 970224312 / 910853457 negotiation; S-Series pilot; UESC inquiry; Mars accident
LOG#00987Intercepts — Traxus ChatsSekGen cargo SG-4521 GPS desync; Traxus logistics concern
STARTING_LINE.logIntercepts — UESC TerminalSekGen named secondary party in UESC multi-target intelligence breach assessment
Triage ShellCodex — Runner TriageSEKGEN named co-developer of the Triage Shell with Traxus and UESC
Thief ShellCodex — Runner ThiefSEKGEN in-house origin of the Thief Shell; internal raid story; UESC probe of SekGen in late 2885; Dr. Yoki Samura / ICON persona

Source-silent / open questions

  • The nature, scale, and content of the “S-Series biomata” referenced in the Traxus PO addendum and the all-staff announcement are not described in the pack. Source-silent.
  • Sato Yori’s concern about releasing new-model worm and nesting systems to Traxus (the risk of losing exclusive proprietary ownership) is not resolved in any subsequent intercept. Whether SekGen ultimately complied fully or withheld specific technologies is source-silent.
  • The UESC legal citation “UESC v. TelaraTrax, Lmt., 943 MC 711 (2614)” suggests established corporate-privacy precedent but no details of the case or outcome appear in the pack. Source-silent.
  • The codeword string “100 97 101 100 97 108 117 115” transmitted between SekGen contacts for Traxus security handshake: its decoded meaning (if any) is not established in the pack. Source-silent.
  • The Attachment links in the email intercepts (e.g., “Invitation Illuminate 2888,” “Sekiguchi Group – Traxus Global 970224312,” “BIOMAT_SSERIES_PROTOTYPE_CUST”) are referenced but the attachment contents are not reproduced in the pack. Source-silent.
  • The specific lore-bearing content of UESC incident casefiles casefile614-4, casefile448-a, and casefile5cf-0 is classified/redacted in the source. Source-silent.
  • “PRO:GO” and its target (referenced in STARTING_LINE.log) are classified throughout the document. What SekGen’s secondary-party role entailed remains source-silent.
  • The SIMbiont is described as “created by a different megacorporation” in the ONI summary header. Whether that corporation is SekGen itself (contradicted by the phrasing) or another unnamed entity is ambiguous. Source-silent.
  • The SIMbiont trial identifier SGT-P1-75706C206C6966 contains what may be hex-encoded text; its decoded content (if intended) is not established in the pack. Source-silent.
  • SekGen’s current status during M2026 Present Day gameplay (whether its Earth/Sol operations are still active, whether Nona is an AI or human, where SekGen’s headquarters tower is located beyond “floor 149” references) is not explicitly stated. Source-silent.
  • The KAAL1 protocol (mapping relatable traits to synthetic frames) and its relationship to any M2026-era tech is not followed up in any other pack volume. Source-silent.

Cross-references

NuCaloric · New Cascadia · The Anomaly · Traxus · CyberAcme · Nona · MIDA · UESC Marathon · Bernard Strauss · Runners

Where it appears in the vault

Cerberus, CyberAcme, Dire Marsh, Felini, MIDA, Marathon 2026, New Cascadia and the Anomaly, Nona, NuCaloric, Project Goliath, Runners, Traxus, WEAVEworms

Mirror pages

The local 1:1 pages this hub’s citations resolve to — the twin’s own ground truth.

Sources

Every factual claim above is cited to primary Marathon source material — see Sources below. Cross-corpus connections and interpretation are the vault’s own; where the games are silent, this page says so.

Footnotes

  1. SekGen Overview · src ↗ ↩ ↩2 ↩3

  2. An Introduction to WEAVEworms · src ↗ ↩ ↩2

  3. An Introduction to SYNTHsilk · src ↗ ↩ ↩2

  4. Shell Print Process Overview · src ↗ ↩

  5. WEAVEworm Technological Timeline · src ↗ ↩

  6. Matter, Converted · src ↗ ↩

  7. Code Fragments: SIMbiont · src ↗ ↩

  8. Metabolic Readout · src ↗ ↩

  9. Inter-Corp Transmission · src ↗ ↩

  10. Pet Project Collaboration · src ↗ ↩

  11. Felini Deliverables · src ↗ ↩

  12. Felini Troubleshooting · src ↗ ↩

  13. XQREL-読み込み成功 · src ↗ ↩

  14. 149階 北西ブロック、トイレ使用停止 · src ↗ ↩

  15. 149階 北西ブロック、トイレ復旧完了 · src ↗ ↩

  16. リマインダー：トラクサス・イルミネート・カンファレンス（1） · src ↗ ↩

  17. URGENT: PO INITIATION · src ↗ ↩

  18. 至急：転送・返信不可 · src ↗ ↩

  19. 至急：転送・返信不可 · src ↗ ↩

  20. 至急：不在予定 · src ↗ ↩

  21. URGENT: ORDER 970224312 ADDENDUM · src ↗ ↩

  22. 緊急：火星における重大事故の発生 · src ↗ ↩

  23. 緊急：オキシア・パルスの事故に関する最新情報 · src ↗ ↩

  24. 至急：UESCによる個人情報開示請求 · src ↗ ↩

  25. トラクサス社の発注書が承認されました · src ↗ ↩

  26. 新たなイノベーションによるパートナーシップ強化 · src ↗ ↩

  27. 新たな活躍の機会 · src ↗ ↩

  28. [[Leela/Marathon 2026/intercepts-traxus/LOG-00987|LOG#00987]] · src ↗ ↩

  29. STARTING_LINE.log · src ↗ ↩

  30. Crew Chatter Log · src ↗ ↩

  31. Triage Shell · src ↗ ↩

  32. Thief Shell · src ↗ ↩ ↩2

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