Binding of galactose-specific lectin PNA to the surface of erythrocyte membrane decreased by more than 90% in stressed rats. In the presence of sodium dodecyl sulfate, the lectin-binding fraction was electrophoretically separated into 3 major glycoprotein subfractions with molecular weights of 25, 37, and 50 kDa.

Quantitative distribution of bioactive substances in the brain of aggressive rats was studied. The norepinephrine/serotonin ratio increased in the temporal and parietal lobes, hypothalamus, and hippocampus of killer rats. The open filed behavior of aggressive rats is characterized by a long latency period, low locomotor activity, and slow movements. Exposure to constant darkness aggravated abnormal behavioral characteristics of aggressive rats. Serotonin content in the hypothalamus and visual cortex of these rats decreased by 75 and 76%, respectively.