The 2.0 A crystal structure of Scapharca tetrameric hemoglobin: cooperative dimers within an allosteric tetramer.
Royer WE, Heard KS, Harrington DJ, Chiancone E. The 2.0 A crystal structure of Scapharca tetrameric hemoglobin: cooperative dimers within an allosteric tetramer. J Mol Biol. 1995 Oct 13; 253(1):168-86.