Abstract
Intracerebral injections of acetoxycycloheximide caused profound inhibition of cerebral protein synthesis but, unlike injections of puromycin, were without effect on memory of simple maze learning in mice. Intracerebral injection of a mixture of the 2 antibiotics, which also caused profound inhibition of cerebral protein synthesis, protected memory against the destructive effects of puromycin when injected alone. An effort is made to explain these observations in terms of the preservation of quantitative changes in messenger RNA which may accompany a learning experience.