streptavidin

noun
strep·ta·vi·din | \ˌstrep-ˈtav-əd-ən, -tə-ˈvīd-ᵊn \

Medical Definition of streptavidin 

: a protein similar to avidin that is produced by a bacterium of the genus Streptomyces (S. avidinii), has four identical subunits that each bind tightly to a molecule of biotin, and is used especially in the detection of molecules (as nucleic acids or antibodies) linked to a biotin label

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