4ZWB:
reference: Molecular basis of ligand recognition and transport by glucose transporters., Deng D, Sun P, Yan C, Ke M, Jiang X, Xiong L, Ren W, Hirata K, Yamamoto M, Fan S, Yan N, Nature. 2015 Jul 15. doi: 10.1038/nature14655. PMID: 26176916

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