somatotropin intrauterine hGH rupiahs fibroblast achondroplasia angiopoietin Cicadulina retardation secretagogue photoinhibition chondrodysplasia ossification Neutropenia arthrogryposis cytochalasin Neoplasia preterm vasodilatory somatropin dimpling Myostatin Dwarfism rhizobacteria hypotonia epiphysis hormone undernutrition craniosynostosis FGF2 exostosis bFGF endochondral oxido NGF undiscerning cause micropenis Gibberellins