Myosin regulatory subunit that plays an essential role to maintain muscle integrity during early development (By similarity). Plays a role in muscle contraction (By similarity). Myosin is a hexamer of 2 heavy chains and 4 light chains. N,N,N-trimethylalanine found in this myosin light chain would not have been detected in the N-terminal tryptic peptide in PubMed:863872 and PubMed:352892 because it would remain trimethylated and ninhydrin negative after hydrolysis. This chain binds one calcium ion.