Thursday, October 28, 2010


What Is Epigenetics?

"The cells in a multicellular organism have nominally identical DNA sequences (and therefore the same genetic instruction sets), yet maintain different terminal phenotypes. This nongenetic cellular memory, which records developmental and environmental cues (and alternative cell states in unicellular organisms), is the basis of epi-(above)–genetics." Introduction to special issue of Science on Epigenetics.

RNA-directed deposition of epigenetic signals.

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