Many of these organs are cultured in vitro from the gene-seed, whilst others require that the gene-seed be injected into the Aspirant's body and then grow into a new organ using the implantee's own physiological processes. All Space Marine Chapters use the gene-seed organs to unleash and control the metabolic processes that transform an ordinary mortal into a Space Marine. The gene-seed itself is encoded with all the genetic information needed to reshape ordinary human cell clusters into the special organs Space Marines possess in those instances where they are not directly implanted after being cultured outside the body. The gene-seed contains genetically-engineered viral machines which rebuild the male human body according to the biological template contained within it and originally cra