The product of the ABC half-transporter gene ABCG2 (BCRP/MXR/ABCP) is expressed in the plasma membrane - Rocchi, E; Khodjakov, A; Volk, E L; Yang, C H; Litman, T; Bates, S E; Schneider, E (Biochem Biophys Res Commun, 2000)