3GKT:
reference: The structure of neuroglobin at high Xe and Kr pressure reveals partial conservation of globin internal cavities., Moschetti T, Mueller U, Schulze J, Brunori M, Vallone B, Biophys J. 2009 Sep 16;97(6):1700-8. doi: 10.1016/j.bpj.2009.05.059. PMID: 19751675

This OCA Structure page
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