sost-and-its-paralog-sostdc1-coordinate-digit-numbSost and its paralog Sostdc1 coordinate digit number in a Gli3-dependent manner5bonecelldigitdiseasedistalectodermembryogenomehandkidneylimborganosteocytepointpolydactylyproximalsclerosteosissyndactyly7178FalseE-GEOD-44325mouse1