According to my medical physiology by Rhodes and Bell their description is as follows:
the essential light chain is necessary for myosin stability, and the other chain called the regulatory light chain is phosphorylated during muscle activity and serves to modulate muscle function*
However, according to molecular biology 4th edition:
it states that the light chains both exert their function via Calcium binding, they make no mention of phosphorylation.
So do light chains regulate myosin by calcium binding, phosphorylation or both ?