6F2W:
reference: L amino acid transporter structure and molecular bases for the asymmetry of substrate interaction., Errasti-Murugarren E, Fort J, Bartoccioni P, Diaz L, Pardon E, Carpena X, Espino-Guarch M, Zorzano A, Ziegler C, Steyaert J, Fernandez-Recio J, Fita I, Palacin M, Nat Commun. 2019 Apr 18;10(1):1807. doi: 10.1038/s41467-019-09837-z. PMID: 31000719

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