Intellectual Developmental Disorder, Autosomal Recessive 2, also known as mental retardation, autosomal recessive 2a, is related to autosomal recessive intellectual developmental disorder and plasma cell neoplasm. An important gene associated with Intellectual Developmental Disorder, Autosomal Recessive 2 is CRBN (Cereblon). Affiliated tissues include brain and lymph node, and related phenotypes are self-injurious behavior and intellectual disability, mild