Hydrolethalus Syndrome 2, also known as hls2, is related to acrocallosal syndrome and culler-jones syndrome. An important gene associated with Hydrolethalus Syndrome 2 is KIF7 (Kinesin Family Member 7), and among its related pathways/superpathways is Ciliopathies. Affiliated tissues include brain, and related phenotypes are molar tooth sign on mri and postaxial hand polydactyly