3RSM:
reference: Solution NMR of a 463-residue phosphohexomutase: domain 4 mobility, substates, and phosphoryl transfer defect., Sarma AV, Anbanandam A, Kelm A, Mehra-Chaudhary R, Wei Y, Qin P, Lee Y, Berjanskii MV, Mick JA, Beamer LJ, Van Doren SR, Biochemistry. 2012 Jan 24;51(3):807-19. Epub 2012 Jan 17. PMID: 22242625

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