Functionally important pocket on the surface of dimeric Yersinia pestis SspA. The pocket is visualized with space-filling models and indicated with the positions of four residues, H85 and Y92 from both subunits. Positive and negative potentials are indicated by blue and red colors, respectively (Hansen, Gu, Li, Andrykovitch, Waugh, Jin, and Ji, J. Biol. Chem. 2005; 208:17380-17391. Abstract).