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http://en.wikipedia.org/wiki/Biotin
Biotin is widely used throughout the biotechnology industry to conjugate proteins for biochemical assays.[34] Biotin's small size means the biological activity of the protein will most likely be unaffected. This process is called biotinylation. Because both streptavidin and avidin bind biotin with high affinity (Kd of 10−14 mol/l to 10−15 mol/l) and specificity, biotinylated proteins of interest can be isolated from a sample by exploiting this highly stable interaction.
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