Carbonic Anhydrase Refined X-ray crystal structure of human carbonic anhydrase II at 2.0 A resolution. Reference: PDB Code 1CA2: Eriksson, A.E., Jones, T.A., Liljas, A., 1988 Proteins Vol 4: 274-282, DOI: 10.1002/prot.340040406 (Also Note; at any time you can use your mouse to move the molecule or click on the JSmol icon to use JSmol tools)