| http://www.w3.org/ns/prov#value | - Further preferred examples of biological substances are biotin, nucleic acids, antibodies or antibody fragments, polypeptide antigens i.e. immunologically reactive polypeptides or haptens i.e. organic molecules with a molecular weight of 150 to 2000, in particular molecules with a steroid backbone such as cardenolides, cardenolide-glycosides (e.g. digoxin, digoxigenin), steroid alkaloids, sexual h
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