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. 2015 Nov 17;5:16641. doi: 10.1038/srep16641

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. Flipped-out and flipped-over conformations of residues 300–304 are shown in grey and green, respectively. A putative access channel (HCY-binding site) is indicated by an ellipsoid. The Cys79 and Asn80 residues lining the putative access channel¹² are marked.