Induced pluripotent stem (iPS) cells ___________.
(a) are created by the expression of a set of key genes in cells derived from adult tissues so that these cells can differentiate into a variety of cell types.
(b) require a supply of donor egg cells, such as embryonic stem cells.
(c) can differentiate into a greater variety of adult tissues than embryonic stem cells.
(d) are created by nuclear transplantation.
Answer:

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