Synpolydactyly 2, also known as synpolydactyly type 2, is related to polydactyly, preaxial iv and chromosome 2q35 duplication syndrome. An important gene associated with Synpolydactyly 2 is FBLN1 (Fibulin 1). Affiliated tissues include bone and thymus, and related phenotypes are toe syndactyly and tarsal synostosis