Mandibuloacral Dysplasia with Type B Lipodystrophy, also known as madb, is related to mandibuloacral dysplasia with type a lipodystrophy and calcinosis. An important gene associated with Mandibuloacral Dysplasia with Type B Lipodystrophy is ZMPSTE24 (Zinc Metallopeptidase STE24). Affiliated tissues include skin and bone, and related phenotypes are micrognathia and abnormality of the skeletal system