Editing Gene-seed (section)

===Implantation===
Not everyone is compatible with implantation (unless it's from the Blood Angels line); potential candidates are screened for tissue compatibility, and kept young, as being post-pubescent has a marked increase in the tissue rejection rate (and being actually ''elderly'' makes it even worse); even so, not all candidates survive the implantation process. The Great Crusade era had inductees from a variety of ages, possibly because there were more resources, candidates, and understanding of the tech to compensate for failure rates. Back then a one-in-two success after screening was considered pretty good. These days the screening is insanely brutal amongst Loyalist chapters, with most aspirants dying before being even considered for implantation, but the success rate is accordingly much higher. Youths are also still preferred post-Heresy as they are easier to mould and condition into loyal Marines than teens or young adults.

One of the most obvious and well-known features of the implants design is that the Emperor never bothered with making them compatible with female hosts (although some argue that this was deliberate as a way of ensuring that Space Marines could not breed true, nobody can be entirely sure). Furthermore, not all organs can be implanted at once, as some prepare the body for others, and the body needs time to adapt to and accept the implants. The maximum speed process has been described in the fluff as taking around 6 years and assuming the soon-to-be Marine will be a Primaris is:

# If you are the Space Wolves, the Canis Helix.
# Secondary Heart, Ossmodula (bone growth), and Biscopea (muscle growth).
# Sinew Coils (tendon/ligament reinforcement), Magnificat (enhances all other geneseed organs), and Belisarean Furnace (combat stimms, attaches to hearts).
# Haemastamen (improved red blood cells) and Larraman's Organ (improved platelets).
# Catalepsean Node (brain implant: sleep like a dolphin).
#*If this is an actual Space Marine, begin hypnotherapy/brainwashing only ''after'' this implant.
# Preomnor (gullet), Omophagea (flatworm stomach), and Multi-lung (third lung).
# Occulobe (improved visual cortex).
# Lyman's Ear (replacement outer, middle, and inner ear).
# Sus-an Membrane (brain implant: self-induce coma).
# Melanochrome (lymph implant for radiation resistance).
# Oolitic Kidney (enhanced liver/kidney) and Neuroglottis (improved inner nose).
# Mucranoid (secretable space suit).
# Betcher's Gland (extremely acidic saliva).
# Both Progenoids (for reproduction).
# Black Carapace (for improved power armour compatibility).

The largest time gap between implants is between the Betcher Glands and the two last ones on the list, and by that time the Marine already serves as a Scout. Once he is deemed physically and mentally ready, he will recieve the Progenoids and the Black Carapace that turns him into a full-fledged (Primaris) Marine.

The Rubicon Primaris most likely entails the implantation of the three Primaris gene-seed organs past the normal time that gene-seed would normally be implanted, though the specific order of implanting in this scenario is currently unknown, however it is known that the Furnace resuscitation is needed to finish the process so it might come in first. The logical follow up is the enhancing Magnificat and finished with the Sinew Coils, the pain of which would cause clinical death through shock, brute forcing the Furnace into activating and charging the Marine up.