Polydactyly, Preaxial Ii, also known as polydactyly of a triphalangeal thumb, is related to chromosome 2q35 duplication syndrome and tibia, hypoplasia or aplasia of, with polydactyly. An important gene associated with Polydactyly, Preaxial Ii is LMBR1 (Limb Development Membrane Protein 1), and among its related pathways/superpathways are Wnt / Hedgehog / Notch and CKAP4 signaling pathway map. Affiliated tissues include bone and t cells, and related phenotypes are preaxial hand polydactyly and duplication of thumb phalanx