Arthrogryposis, Distal, Type 2b3, also known as da2b3, is related to arthrogryposis syndrome and lethal congenital contracture syndrome 4. An important gene associated with Arthrogryposis, Distal, Type 2b3 is MYH3 (Myosin Heavy Chain 3), and among its related pathways/superpathways are Cardiac conduction and Cytoskeleton remodeling Regulation of actin cytoskeleton by Rho GTPases. Related phenotypes are downslanted palpebral fissures and narrow mouth