LIFESCI 2A03 Lecture Notes - Lecture 4: Somatic Cell Nuclear Transfer, Mesoderm, Inner Cell Mass

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Flat worms regenerate 2-4 weeks depends on size, and portion that is regenerated. 2 key properties self renewal (can divide to make more stem cells), and potency (can differentiate into variety of other cell types. Dynamic they change their identity over time, some days it is stem cell others it is not. Cells that can proliferate and differentiate to yield some or all specialized cell types of tissue or organ. Adult tissues/organs have their own pool of adult stem cells. They can remain dormant for a long time. Difference between progenitor and stem cells is progenitor can divide only a limited number of times, whereas stem cells keep doing it. Intermediate cell is called a precursor or progenitor cell, progenitor cells in fetal or adult tissues are partly differentiated cells that give rise to differentiated cells. Progenitor cells are unipotent, stem cells are pluripotent or totipotent. Progenitor cannot self renew, but stem cells can (multipotent or unipotent)

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