| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Severe intellectual disability, epilepsy, anal anomaly, distal phalangeal hypoplasia syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Seizures and intellectual disability due to hydroxylysinuria syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Retinitis pigmentosa, intellectual disability, deafness, hypogenitalism syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Psychomotor retardation due to S-adenosylhomocysteine hydrolase deficiency | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Macrocephaly, obesity, mental disability, ocular abnormality syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Laryngeal abductor paralysis with intellectual disability syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Kleefstra syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Infantile choroidocerebral calcification syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Temple Baraitser syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| X-linked spasticity, intellectual disability, epilepsy syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| 5-amino-4-imidazole carboxamide ribosiduria | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Paraplegia, brachydactyly, cone-shaped epiphysis syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Bullous dystrophy macular type | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| X-linked intellectual disability Brooks type | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Intellectual disability Buenos Aires type | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Cerebellar ataxia, intellectual disability, optic atrophy, skin abnormalities syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Neurofaciodigitorenal syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Caudal appendage deafness syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Central nervous system calcification, deafness, tubular acidosis, anemia syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Weaver Williams syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Short stature, unique facies, enamel hypoplasia, progressive joint stiffness, high-pitched voice syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Intellectual disability, cataract, calcified pinna, myopathy syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| X-linked intellectual disability Hedera type | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| X-linked intellectual disability Nascimento type | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Cortical blindness, intellectual disability, polydactyly syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| X-linked intellectual disability, limb spasticity, retinal dystrophy, diabetes insipidus syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Osteopenia, intellectual disability, sparse hair syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Brachydactyly and preaxial hallux varus syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Spastic paraplegia with precocious puberty syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Branchial dysplasia, intellectual disability, inguinal hernia syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Epilepsy, microcephaly, skeletal dysplasia syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Epilepsy telangiectasia syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Encephalopathy, intracerebral calcification, retinal degeneration syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Dysmorphism, short stature, deafness, disorder of sex development syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Marfanoid habitus with autosomal recessive intellectual disability syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Alaninuria, microcephaly, dwarfism, enamel hypoplasia, diabetes mellitus syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Microcephalus, glomerulonephritis, marfanoid habitus syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Spastic paraplegia, glaucoma, intellectual disability syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Pseudoprogeria syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Facial dysmorphism, macrocephaly, myopia, Dandy-Walker malformation syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Metaphyseal dysostosis, intellectual disability, conductive deafness syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Preaxial polydactyly, colobomata, intellectual disability syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Microcephalus, digital anomaly, intellectual disability syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Ichthyosis, intellectual disability, dwarfism, renal impairment syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Van den Bosch syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Aniridia, renal agenesis, psychomotor retardation syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Thumb stiffness, brachydactyly, intellectual disability syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Megalocornea with intellectual disability syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Ectodermal dysplasia, intellectual disability, central nervous system malformation syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Skeletal abnormality, cutis laxa, craniostenosis, ambiguous genitalia, retardation, facial abnormality syndrome | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Alpha-thalassemia intellectual disability syndrome linked to chromosome 16 | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| [X]Other mental retardation | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| [X]Unspecified mental retardation | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Other specified mental retardation | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Mental retardation NOS | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Profound intellectual development disorder without impairment of behaviour | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Profound intellectual development disorder with significant impairment of behaviour | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Profound intellectual development disorder with minimal impairment of behaviour | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Profound intellectual development disorder with impairment of behaviour | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Severe intellectual development disorder without significant impairment of behaviour | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Severe intellectual development disorder with significant impairment of behaviour | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Severe intellectual development disorder with minimal impairment of behaviour | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Severe intellectual development disorder with impairment of behaviour | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Moderate intellectual development disorder without significant impairment of behaviour | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Moderate intellectual development disorder with significant impairment of behaviour | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Moderate intellectual development disorder with minimal impairment of behaviour | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Moderate intellectual development disorder with impairment of behaviour | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Mild intellectual development disorder without significant impairment of behaviour | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Mild intellectual development disorder with significant impairment of behaviour | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Mild intellectual development disorder with minimal impairment of behaviour | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Mild intellectual development disorder with impairment of behaviour | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Intellectual development disorder without significant impairment of behaviour | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Intellectual development disorder with significant impairment of behaviour | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Intellectual development disorder with minimal impairment of behaviour | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  | 
| Intellectual development disorder with impairment of behaviour | Is a | False | Mental retardation | Inferred relationship | Existential restriction modifier |  |