3WMF:
reference: Structural basis for gating mechanisms of a eukaryotic P-glycoprotein homolog., Kodan A, Yamaguchi T, Nakatsu T, Sakiyama K, Hipolito CJ, Fujioka A, Hirokane R, Ikeguchi K, Watanabe B, Hiratake J, Kimura Y, Suga H, Ueda K, Kato H, Proc Natl Acad Sci U S A. 2014 Mar 3. PMID: 24591620

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