ATP-binding cassette transporter, sub-family G protein that functions as a high capacity UREA exporter, transporter of STEROLS, and in the absorption and efflux of many drugs. Its efflux activity for ANTINEOPLASTIC AGENTS contributes to DRUG RESISTANCE. It functions as a homodimer and is expressed by cells in a variety of organs, as well as by NEOPLASTIC STEM CELLS.

Synonyms: 0, ABCG2 Transporter, ATP Binding Cassette Transporter, Sub-Family G, Member 2, ATP Binding Cassette Transporter, Subfamily G, Member 2, CD338 Antigen, ABCG2 Protein