Streptavidin. Streptavidin is a 60 kDa non-glycosylated
protein composed of four identical subunits, each of
which has a binding site for biotin, and is purified from
the microorganism Streptomyces avidinii. This protein
resembles egg white avidin in its biotin binding properties.
In most applications, streptavidin and avidin conjugates are
interchangeable.
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