Thanatophoric Dysplasia, Type Ii, also known as td2, is related to thanatophoric dysplasia, type i and kleeblattschaedel. An important gene associated with Thanatophoric Dysplasia, Type Ii is FGFR3 (Fibroblast Growth Factor Receptor 3). Affiliated tissues include bone and temporal lobe, and related phenotypes are macrocephaly and hypotonia