1YCB:
reference: Distal pocket polarity in ligand binding to myoglobin: deoxy and carbonmonoxy forms of a threonine68(E11) mutant investigated by X-ray crystallography and infrared spectroscopy., Cameron AD, Smerdon SJ, Wilkinson AJ, Habash J, Helliwell JR, Li T, Olson JS, Biochemistry 1993 Dec 7;32(48):13061-70. PMID: 8241160

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