Chick Stem Cells
A stem cell is defined as a proliferating cell with the ability to renew itself. In the adult organism, such cells are required to maintain a continuous supply of cells to compensate for cell loss throughout the lifetime of the individual and therefore include the basal proliferating cells that renew the epidermis, specialized cells that maintain the inner lining of the digestive system, progenitors of the spermatozoa in the male, hematopoietic progenitors responsible for ensuring a supply of blood cells, and probably the olfactory epithelium, which produces sensory neurons throughout life. The fertilized egg itself could be considered as a stem cell, since subsequent divisions generate all the somatic cells of the organism as well as germ cells.
KeywordsStem Cell Neural Crest Chick Embryo Primitive Streak Asymmetric Cell Division
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