Enkephalins increase cyclic adenosine monophosphate content, calcium uptake, and contractile state in cultured chick embryo heart cells.
Laurent S, Marsh JD, Smith TW. Enkephalins increase cyclic adenosine monophosphate content, calcium uptake, and contractile state in cultured chick embryo heart cells. J Clin Invest. 1986 May; 77(5):1436-40.