The living therapies

Therapies derived from the living include proteins and cells. Proteins used as therapies are mainly obtained from human plasma, usually after several steps of purification. Some animal proteins are still used. These natural p roteins are progressively replaced by proteins produced by recombinant tech nology. Cells used as therapy include blood cells (red, white and platelets ), allogeneic and autologous hematopoietic stem cells, epidermal cells expa nded in culture. Other cellular therapies are at different stages of experi mentation: cells of the Immune system, Langerhans islets, hepatocytes, embr yonic neuronal cells. More research on stem cells, their regulation and pla sticity is a perequisite for new progresses, Procedures to evaluate these e merging therapies are in continuous construction.