(A) Representative pictures of wild type and Jab1 cKO mice at postnatal days 6, 12, and 18, displaying the progressive dwarfism. (B) The quantification of the length and weight of wild type, Osx-cre only, and Jab1 cKO mice at postnatal day 18. Error bars represent means ± SD. ** p < 0.01, *** p < 0.001, ***** p < 0.00005 when Osx-cre only and Jab1 cKO are compared with wild type. # p < 0.05 when Jab1 cKO is compared with Osx-cre only. Wild type, n = 12; Osx-cre only, n = 8; Jab1 cKO, n = 9.