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March 09, 2001 Scientists Discover Memory-Enhancing Switch Scientists have genetically engineered mice with enhanced memory that persists until researchers switch it off by removing a drug that controls a gene that encodes a key memory-governing enzyme. With enhanced memory, the mice perform better on memory tests and then revert to normal when the drug is removed. The achievement, say the researchers who developed the mouse model, offers important insights into the delicate molecular balance by which memory storage is achieved. Although memory-boosting drugs are a long way off, the researchers believe that the work opens new avenues for understanding the molecular basis of memory.