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Model of the third extracellular loop of ABCG2 (amino acids 563–618) obtained by ab initio folding employing discrete molecular dynamics. The structure is colored blue to red from the N to the C terminus. Cysteines involved in intramolecular and intermolecular interactions are represented with sticks and are colored magenta. The glycosylation site (Asn-596) is represented by a blue stick.
