4UUR:
reference: Structural flexibility of the heme cavity in the cold-adapted truncated hemoglobin from the Antarctic marine bacterium Pseudoalteromonas haloplanktis TAC125., Giordano D, Pesce A, Boechi L, Bustamante JP, Caldelli E, Howes BD, Riccio A, di Prisco G, Nardini M, Estrin D, Smulevich G, Bolognesi M, Verde C, FEBS J. 2015 Jun 4. doi: 10.1111/febs.13335. PMID: 26040838

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