Congenital Myopathy 9a, also known as myopathy, congenital, with respiratory insufficiency and bone fractures, is related to congenital myopathy 9b. An important gene associated with Congenital Myopathy 9a is FXR1 (FMR1 Autosomal Homolog 1). Affiliated tissues include bone and skeletal muscle, and related phenotypes are neonatal hypotonia and motor delay