L-seryl-[myosin light chain] + ATP = O-phospho-L-seryl-[myosin light chain] + ADP + H(+)
l-seryl-[myosin light chain] + atp = o-phospho-l-seryl-[myosin light chain] + adp + h(+)
L-seryl-[myosin light chain] + ATP = O-phospho-L-seryl-[myosin light chain] + ADP + H(+)
l-seryl-[myosin light chain] + atp = o-phospho-l-seryl-[myosin light chain] + adp + h(+)