Predicted to enable myosin heavy chain binding activity. Predicted to be involved in myofibril assembly. Predicted to be part of myosin II complex. Predicted to be active in myofibril and stress fiber. Is expressed in smooth muscle cell. Human ortholog(s) of this gene implicated in familial hypertrophic cardiomyopathy and megacystis-microcolon-intestinal hypoperistalsis syndrome. Orthologous to human MYL9 (myosin light chain 9).