Monday, December 13, 2010

Property of Stem cell.

Self-renewal.
Obligatory asymmetric replication a stem cell divides in to daughter cell that is identical to the original stem cell and another stem cell is differentiated.
Stochastic differentiation when one stem cell develop into two differentiated daughter cell another stem cell undergone mitosis and produces two stem cells identical to the original.

Potency definition.
1. Totipotent .
These cells are produced from fusion of an egg and sperm cell. Cells produced by the first few divisions of the fertilized egg are also totipotent.
2. Pluripotent.
These cells derived form any of the three germ layers.
3.Multipotent.
These cell can differentiate into a number of cells. but only those of a close related family cells.
4.Oligopotent.
This cell only differentiate into a few cells such as lymphoid or myeloid stem cell.
5. Unipotent.
It can only one produce cell type. but have the property of self-renewal which distinguish them from non-stem cell.




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