Congenital Myopathy 2b, Severe Infantile, Autosomal Recessive, also known as cmyp2b, is related to congenital myopathy 2c. An important gene associated with Congenital Myopathy 2b, Severe Infantile, Autosomal Recessive is ACTA1 (Actin Alpha 1, Skeletal Muscle). Affiliated tissues include skeletal muscle and lung, and related phenotypes are hypotonia and respiratory insufficiency