Intellectual Developmental Disorder, X-Linked, Syndromic, Snyder-Robinson Type, also known as mrxssr, is related to syndromic x-linked intellectual disability snyder type and silver-russell syndrome 1. An important gene associated with Intellectual Developmental Disorder, X-Linked, Syndromic, Snyder-Robinson Type is SMS (Spermine Synthase). Affiliated tissues include cortex and brain, and related phenotypes are intellectual disability and scoliosis