Intellectual Developmental Disorder, X-Linked, Syndromic 14, also known as mrxs14, is related to syndromic x-linked intellectual disability 14 and non-syndromic x-linked intellectual disability 14. An important gene associated with Intellectual Developmental Disorder, X-Linked, Syndromic 14 is UPF3B (UPF3B Regulator Of Nonsense Mediated MRNA Decay). Affiliated tissues include brain, and related phenotypes are intellectual disability, mild and intellectual disability