Required for efficient RNA interference (RNAi) (PubMed:16723499, PubMed:18245353). Plays a role in germline development (PubMed:16723499, PubMed:18245353). Expressed in the intestine in both larvae and adults (PubMed:17850180). Expressed in the gut of males (PubMed:15522294). Expressed in embryos. Belongs to the ABC transporter superfamily. ABCG family. Eye pigment precursor importer (TC 3.A.1.204) subfamily.