Brachydactyly, Type A1, B, also known as brachydactyly type a1b, is related to brachydactyly, type a1 and brachydactyly. An important gene associated with Brachydactyly, Type A1, B is BDA1B (Brachydactyly, Type A1, Locus B). Affiliated tissues include bone, and related phenotypes are short stature and short 5th metacarpal