Scientists have identified a chemical that makes new neurons grow. The substance works specifically in a part of the brain that is integral to learning and memory. The discovery, made after researchers systematically and painstakingly infused each of 1,000 different chemicals into the brains of live mice, could point the way to a new type of neuroprotective drug for people with Alzheimer's or other neurodegenerative diseases, according to the report in the July 9th issue of the journal Cell, a Cell Press publication... 
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