| http://www.w3.org/ns/prov#value | - Although biotin succinimidyl ester (B1513) can be used to biotinylate amines in peptides, proteins and other biomolecules, we strongly recommend the biotin-X and biotin-XX succinimidyl esters (B1582, B1606), and especially the water-soluble biotin-X and biotin-XX sulfosuccinimidyl esters (B6353, B6352), because their additional 7- and 14-atom spacers greatly facilitate binding to avidin conjugates
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