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Mutual distances of Cα-positions after pairwise superposition of the A chains from the tetrameric streptavidin crystal structures: SAm1•StrepII versus wtSA•biotin (1swu; Freitag et al. 1999), SAm1•StrepII versus wtSA•StrepII (1rsu; Schmidt et al. 1996), SAm1•StrepII versus apo-SAm1, apo-SAm2 versus apo-SAm1, and apo-SAm2 versus SAm2•StrepII.
