1GDI:
reference: The binding of carbon monoxide and nitric oxide to leghaemoglobin in comparison with other haemoglobins., Harutyunyan EH, Safonova TN, Kuranova IP, Popov AN, Teplyakov AV, Obmolova GV, Valnshtein BK, Dodson GG, Wilson JC, J Mol Biol. 1996 Nov 22;264(1):152-61. PMID: 8950274

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