Progenoid Glands: The progenoid glands are the most basic and most important components of the Space Marines many and varied bio-implants. The glands, located in the neck and chest, serve to collect and store the geneseed itself. Through the medium of the progenoids, Chapter Apothecaries can gather the geneseed of the fallen and re-implant it into fresh recruits.
The glands mature at different points - the neck gland after 5 years, the chest after 10. Once matured, the glands can be removed; although normal practice is to do so only after a Marine falls in battle.
The Progenoid Glands are implanted second-to-last; the final internal implant before the Black Carapace.
Source: Codex: Ultramarines, 2nd Edition by various, Codex: Space Marines, 3rd Edition by various, Codex: Space Marines, 4th Edition by various, Rogue Trader by various, Warhammer 40,000 4th Edition Rulebook by various, Warhammer 40,000 2nd Edition Rulebook by various, Warhammer 40,000 3rd Edition Rulebook by various
Submitter: Simguinus
Hive World Terra