Nomenclature	ABCG1	ABCG2	ABCG4	ABCG5	ABCG8
Common abreviation	ABC8	ABCP	–	–	–
HGNC, UniProt	ABCG1, P45844	ABCG2, Q9UNQ0	ABCG4, Q9H172	ABCG5, Q9H222	ABCG8, Q9H221
Comments	Transports sterols and choline phospholipids [275]	Exhibits a broad substrate specificity, including urate and haem, as well as multiple synthetic compounds [275]. The functional transporter is likely to be a homodimer, although higher oligomeric states have also been proposed.	Putative functional dependence on ABCG1	Transports phytosterols and cholesterol; forms an obligate heterodimer with ABCG8. Loss‐of‐function mutations in ABCG5 are associated with sitosterolemia (OMIM: 210250).	Transports phytosterols and cholesterol; forms an obligate heterodimer with ABCG5. Loss‐of‐function mutations in ABCG8 are associated with sitosterolemia (OMIM: 210250).