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Epigenetics. Epigenetics, includes (1) all of the extrinsic (extraorganismal) factors impinging on vital structures, including importantly mechanical loadings and electroelectric states and (2) all of the intrinsic (intraorganismal) biophysical, biomechanical, biochemical, and bioelectric microenvironmental events occurring on, in, and between individual cells, extracellular materials, and cells and extracellular substances. www.indiandentalacademy.com