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What is an avidin?

What is an avidin? Here are some definitions.

Noun
  1. (biology) A tetrameric protein produced in the oviducts of birds, reptiles and amphibians and deposited in the whites of their eggs.
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Examples
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.

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