“…Furthermore, a single stimulatory dose did not protect the gland from irradiation effects. Thus, the protective effects of this agent do not appear related either to increased secretory activity induced by stimulation of the gland ( 5 , 6,15) or to the mere presence of the catecholamine ( 1-3). I t does appear to be related to gland enlargement induced by the I S 0 ( S ) , and in fact, to a specific phase of the enlargement.…”