1EFQ:
reference: Factors contributing to decreased protein stability when aspartic acid residues are in beta-sheet regions., Pokkuluri PR, Gu M, Cai X, Raffen R, Stevens FJ, Schiffer M, Protein Sci 2002 Jul;11(7):1687-94. PMID: 12070321

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).