Abstract
1. alpha-Amanitin inhibits in vitro the activity of RNA polymerase II of rat brain nuclei. 2. The toxin does not pass the blood-brain barrier, but when injected intracerebrally is highly toxic for rats, and causes inhibition of RNA polymerase II of isolated brain nuclei. 3. Intracerebral injection of alpha-amanitin 6h before training to a passive avoidance task is followed by impaired performance of rats on retesting after 7 days, without affecting performance on retesting immediately after training.
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