# RIKEN BDR x Otsuka Pharmaceutical Collaboration revision history

Append-only Arc G field-change log. Forward-only honesty: events accrue from Arc G adoption.

Partnership: [RIKEN BDR x Otsuka Pharmaceutical Collaboration](/partnerships/riken-bdr-x-otsuka-pharmaceutical-collaboration.md)

## Recorded posture

- First recorded event: 2026-08-22
- Last material change: 2026-08-22
- Material event count: 1
- Editorial event count: 0

## Forward-only note

Arc G is forward-only. The event log accrues from the Arc G adoption point. Fields with no events post-baseline equal the current cached value and are not independently verified at any prior date.

_Canonical URL: /partnerships/riken-bdr-x-otsuka-pharmaceutical-collaboration/history. REST: /v1/partnerships/8acd752f-eb8c-4616-8121-242c968ada47/history. HTML: [/partnerships/riken-bdr-x-otsuka-pharmaceutical-collaboration/history](/partnerships/riken-bdr-x-otsuka-pharmaceutical-collaboration/history)._