_:vb50940269 . _:vb50940269 "url:http://en.wikipedia.org/wiki/Pycnodysostosis"^^ . _:vb50940269 . _:vb50940269 . _:vb50940269 "An osteochondrodysplasia that has_material_basis_in a mutation in the CTSK gene which results_in dwarfism, brittle bones, osteopetrosis, shortening of the distal phalanges."^^ . _:vb50940269 . _:vb50940269 .