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“At 10 mmol/L K+, norepinephrine release was not affected by timolol or atenolol (both 10 μmol/L but was equally inhibited by D- or L-propranolol at 10 μmol/L (-56±5% and -53±9%o, respectively), indicating a β-blocking-independent mechanism.”
“The same stereospecificity was also observed in organ culture when d- or l-propranolol was tested as a blocker of the norepinephrine-induced increase in N-acetyltransferase activity.”