Monarch Disease Ontology id MONDO_0014981 (immunodeficiency 49) is any primary immunodeficiency disease in which the cause of the disease is a mutation in the BCL11B gene. Also known as: BCL11B primary immunodeficiency disease, IMD49, immunodeficiency 49; IMD49, immunodeficiency type 49, primary immunodeficiency disease caused by mutation in BCL11B.