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Protein sequence alignment of the 12 TMs of ABCB1 P-glycoproteins from three mammals (human, mouse, and sheep) and three nematodes (Haemonchus contortus, Caenorhabditis elegans, and Onchocerca volvulus). Two subgroups (mammals and nematodes) can be distinguished. The GenBank accession numbers for the sequences used are as follows: human, P08183; mouse, P21447; sheep, A2VBC7; Caenorhabditis elegans, O01495; Onchocerca volvulus, Q9U8G3; and Haemonchus contortus, O61301.
