1FCS:
reference: Crystal structure of a distal site double mutant of sperm whale myoglobin at 1.6 A resolution., Rizzi M, Bolognesi M, Coda A, Cutruzzola F, Allocatelli CT, Brancaccio A, Brunori M, FEBS Lett 1993 Mar 29;320(1):13-6. PMID: 8462669

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