“Adrenergic antagonists such as dl-propranolol (10(-8)-…) M), oxprenolol (10(-8)-10(-6) M), and practolol (10(-6)-10(-4) … equally the inhibition of alanine and glutamine release, prevented the stimulations of muscle cAMP levels, phosphosphorylase a … the depletion of muscle glycogen produced by either epinephrine or serotonin.”