[‚mī·krō‚hed·ə·rə·jə′nē·əd·ē] (chemistry) A small variation in the chemical structure of a molecule that does not result in a significant change in properties.
microheterogeneity
mi·cro·het·er·o·ge·ne·i·ty
(mī'krō-het'ĕr-ō-jĕ-nē'i-tē), Slight differences in structure between essentially identical molecules, for example, in the saccharide portion of a glycoprotein.