Fig. 2
From: Single particle cryo-EM reconstruction of 52 kDa streptavidin at 3.2 Angstrom resolution
Comparison between the reconstructions of the two SA states. a, c The region around the biotin-binding pocket of the apo-SA EM map has an empty density of the pocket and a missing loop 46–51 density, whereas in b, d the biotin-bound SA EM map, these two densities are well resolved with the atomic model of the biotin ligand and the loop 46–51
