Congenital Myopathy 21 with Early Respiratory Failure, is also known as cmyp21. An important gene associated with Congenital Myopathy 21 with Early Respiratory Failure is DNAJB4 (DnaJ Heat Shock Protein Family (Hsp40) Member B4). Affiliated tissues include skeletal muscle and brain, and related phenotypes are inguinal hernia and intrauterine growth retardation