Slight differences in structure between essentially identical molecules; e.g., in the saccharide portion of a glycoprotein. ... (05 Mar 2000) ... 
Type: Term Pronunciation: mī′krō-het′ĕr-ō-jĕ-nē′i-tē Definitions: 1. Slight differences in structure between essentially identical molecules, in the saccharide portion of a glycoprotein.