Biology 1202B Lecture Notes - Lecture 20: Inner Cell Mass, Embryonic Stem Cell, Umbilical Cord

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Stem cells express telomerase, not to the degree of cancer cells though. Different potency levels: totipotent: differentiate into embryonic extraembryonic cell types (make a complete organism). Barriers to embryonic stem cell research: ethical issues; these are totipotent cells, availability; high number of cells needed to do research. Symmetric cell division: asymmetric, goes into the niche and progenerate cells, progenerate are committed to a cell type. 2: when symmetric differentiation occurs, we ultimately lose a stem cell but a neighboring stem cell symmetrically renews, unipotent and will differentiate into epithelial cells, the cell migrates to the site and becomes an epithelial cell. Factors tell the stem cells to divide and migrate up and differentiate. How to test the potency of stem cells. 5: regenerating one"s own skin, morphological differences - however they all have the same structures that are necessary to function as skin.

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