MONDO_0008555 (thrombocytopenia 2) is an autosomal dominant disorder caused by mutation(s) in the ANKRD26 gene, encoding ANKRD26 protein. Additionally, in one family, a mutation(s) has been identified in the MASTL gene, encoding serine/threonine-protein kinase greatwall. The condition is characterized by mild to moderate bruisability. Also known as: thrombocytopenia type 2.