Cell localization:Cytoplasm.This gene encodesThe regµLatory light chain associated with cardiac myosin beta (or slow) heavy chain. Ca+ triggersThe phosphorylation of regµLatory light chain that in turn triggers contraction. Mutations in this gene are associated with mid-left ventricµLar chamber type hypertrophic cardiomyopathy. [provided by RefSeq, JµL 2008],