Streptavidin derives its name from its bacterial source Streptomyces avidinii and from the hen egg-white protein, avidin, which has high affinity to biotin.
S 5157 (OTTO) Streptavidin, from Streptomyces avidinii essentially salt-free, lyophilized powder, ≥13 units/mg protein Cas 9013-20-1 - used in streptavidin capture enzyme-linked immunosorbent assay (ELISA).