64.  Embryonic stem (ES) cells differ from somatic stem cells in that ...   a)  ES cells can only be derived from early embryos, whereas somatic stem cells are present in adult tissues.   b)  ES cells retain the ability to renew themselves, whereas somatic stem cells do not.   c)  ES cells are pluripotent and can differentiate into any cell type in the developing embryo, whereas somatic stem cells are considered multipotent in that they produce a more limited number of differentiated cell types.   d)  a and c   e)  a, b and c

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