The intestinal absorption of biotin, a vitamin included in yeasts, is actually inhibited by an antibiotin substance present in raw egg whites, avidin. |
For example, fluorescent cyanine and related dyes can be attached to amine, hydroxy or sulfhydryl groups of avidin and to antibodies and to lectins. |
Good examples of vitamin antagonists include isonicotinic acid hydrazide, aminopterin, dicumarol, and avidin. |
Groundwater, too, is protected from contamination because avidin is a biodegradable protein. |
Interaction has been measured in this way for ligand-receptor pairs of biotin and avidin, complementary DNA pairs, and antigen-antibody pairs. |
The reactivity could be weakened by pretreatment with avidin and biotin. |