In accordance with our previous reports showing that the impaired skeletal growth phenotypes in CNP KO mice and NPR-B KO mice are qualitatively identical [3, 4, 7], the written skeletal phenotypes observed in AMDM are fundamentally equal to those seen in CNP KO rats [12, 13, 16]. The gene discussed is NPR2; the disease is acromesomelic dysplasia 1, Maroteaux type.