How does epigenetic modification lead to the anatomical configuration of a multicellular organism during embryogenesis ?

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How does epigenetic modification lead to the anatomical configuration of a multicellular organism during embryogenesis ?

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Epigenetic markers govern a cell’s differentiation status by making certain regions of the genome accessible for transcription, and others closed.

If you’re looking for a *concrete* answer, i.e. gene A turns on histone deacetylase B which unsilences gene C which causes expression of protein D that’s secreted and picked up by neighbouring cells where it acts on receptor E *and so on*, that’s a textbook’s worth of information.