Greig Cephalopolysyndactyly Syndrome, also known as gcps, is related to polydactyly, postaxial, type a1 and craniosynostosis. An important gene associated with Greig Cephalopolysyndactyly Syndrome is GLI3 (GLI Family Zinc Finger 3), and among its related pathways/superpathways are Signal Transduction and Class A/1 (Rhodopsin-like receptors). Affiliated tissues include bone and skin, and related phenotypes are macrocephaly and postaxial hand polydactyly