The function of ABCB5 (ATP binding cassette subfamily B member 5, Ensembl gene identifier ENSG00000004846) is as follows. Energy-dependent efflux transporter responsible for decreased drug accumulation in multidrug-resistant cells (PubMed:12960149, PubMed:15205344, PubMed:15899824, PubMed:22306008). Specifically present in limbal stem cells, where it plays a key role in corneal development and repair (By similarity). {ECO:0000250|UniProtKB:B5X0E4, ECO:0000269|PubMed:12960149, ECO:0000269|PubMed:15205344, ECO:0000269|PubMed:15899824, ECO:0000269|PubMed:22306008}.