DO_rare_slim Cockayne syndrome B DOID:0080908 GARD:1420 A Cockayne syndrome that is characterized by severe physical and mental retardation, microcephaly, progressive neurologic and retinal degeneration, skeletal abnormalities, gait defects, and sun sensitivity with no increased frequency of cancer, and that has_material_basis_in homozygous or compound heterozygous mutation in the gene encoding the group 6 excision repair cross-complementing protein on chromosome 10q11. Cockayne syndrome 2 MIM:133540 Cockayne syndrome type II ORDO:90322 disease_ontology Cockayne syndrome