Yellow Blood Cells (AG-YBC) are antigen blood dosages children receive as part of their development into Parasites. They are also referred to as ‘parasite shots’ by the children.
Yellow blood cell is another name for bone marrow. Bone marrow is the tissue responsible for producing red blood cells.
Yellow blood cells can generally be extracted from humans affected by radiation. It is not considered to be a type of cancer, it is a type of transmissible cancer - which means these cells from another organism can survive and proliferate within an individual.
During the prototype phase of the FRANXX program, Dr. FRANXX discovered that the units required fertile male and female pairs to function. Once this was resolved through his cloning research, he discovered that giving the children frequent dosages of yellow blood cell injections as a conduit for the FRANXX would make the FRANXX operatable and increase the children’s’ capacity and aptitude abilities.
The dosages usually start off with 0.25 milligrams and it increases to 0.75 milligrams as the children get older. However, the doses have significant effects on the children. As preadolescent children, they are emotionally strained to the point of showing no emotions and becoming composed. It is said that is the intention as the objective is to make future parasites obedient and reliant. The dosages can also weaken the children’s bodies, causing them to become vulnerable to fevers and other health risks, possibly affecting their immune systems.
After officially becoming parasites, the children’s dosages are given on occasional checkups rather frequently. By then, the children develop an accelerated ageing process, which, coupled with the stress of piloting a FRANXX, makes them age at a faster rate. The Elixir Injection is a powerful drug of heavy concentrated yellow blood cells and is designed to increase one’s aptitude results but is known for having an incredibly low success rate.
- The children are considered to be ‘contaminated’ but the adults never give an explanation why.
- Zero Two bragged about how she inherited her skills from human and klaxosaur genomes. However, she requires high maintenance (heavy dosage of yellow blood cells) to function.