[pieceofthepuzzle]

Epigenetics. Every cell in your body has the same DNA blueprint, but there are vast differences between a neuron and a cardiac muscle cell and a white blood cell etc. The differences are explained in part by which of the genes in the DNA blueprint are read and expressed in these different cell types. Chemical modifications of DNA and of the proteins that interact with DNA are major determinants of which genes are read and expressed, and these chemical modifications can be altered/affected by environmental exposures.

[zot]

Ping to another layer of complexity.