ABCF2 (ABC28, M-ABC1, HUSSY-18, EST133090, DKFZp586K1823) is a member of the superfamily of ATP-binding cassette (ABC) transporters. ABC proteins are composed of transmembrane domains (TMDs), and nucleotide binding domains (NBDs, or ATP-binding cassettes, ABSs). Based on their sequence similarity scores, the members of the human ABC protein family can be grouped into eight subfamilies, including the MDR/TAP, the ALD, the MRP/CFTR, the ABC1, the White, the RNAseL inhibitor, the ANSA, and the GCN20 subfamilies. ABCF2 is a member of the GCN20 subfamily. ABC proteins transport various molecules across extra- and intracellular membranes.