In experiments on Wistar rats L-lysine (0.15, 0.5, 1.5, 5.0, 15.0, and 50.0 microg/kg intraperitoneally) exhibited a dose-dependent algic effect during electrocutaneous stimulation of the tail and dose-dependent effects in aggressive defense behavior caused by electrical painful stimulation of paws. It was found that the effect of L-lysine depended on situation determining the predominance of defense or aggression, rather than on the intensity of painful stimulation.

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