Scientists have recently developed a process by which a skin cell from a human can be triggered to develop into a human heart muscle cell. This is possible because .
a. most cells in the human body contain the genetic instructions for making all types of human cells;
b. a skin cell is produced when all genes in the cell are expressed; turning off some genes in the cell results in a heart cell;
c. scientists can add new genes to old cells to make them take different forms;
d. a skin cell expresses only recessive alleles, so it can be triggered to produce dominant heart cell alleles;
e. it is easy to mutate the genes in skin cells to produce the alleles required for other cell types
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