ABCA4 and retinal degeneration: Recessive Stargardt disease (STGD1, Online Mendelian Inheritance in Man #248200), caused by biallelic mutations in the ATP-binding cassette sub-family A member 4 (ABCA4, Online Mendelian Inheritance in Man #601691) gene, is one of the main causes for inherited retinal degeneration and loss of vision in early life1,2.