Intellectual Developmental Disorder, X-Linked, Syndromic 34, also known as mrxs34, is related to syndromic x-linked intellectual disability 34. An important gene associated with Intellectual Developmental Disorder, X-Linked, Syndromic 34 is NONO (Non-POU Domain Containing Octamer Binding). Affiliated tissues include brain and pineal, and related phenotypes are macrocephaly and intellectual disability