4Z7F:
reference: Structures of FolT in substrate-bound and substrate-released conformations reveal a gating mechanism for ECF transporters., Zhao Q, Wang C, Wang C, Guo H, Bao Z, Zhang M, Zhang P, Nat Commun. 2015 Jul 22;6:7661. doi: 10.1038/ncomms8661. PMID: 26198469

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