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DEPRESSION CHANGES GRAY MATTER IN YOUNG BRAIN

The brains of children who suffer clinical depression as preschoolers develop differently than those of preschoolers not affected by the disorder, a new study shows. These children’s gray matter—tissue that connects brain cells and carries signals between those cells and is involved in seeing, hearing, memory, decision-making, and emotion—is lower in volume and thinner in the cortex, a part of …

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Bacterial flora of remote tribespeople carries antibiotic resistance genes

Scientists have found antibiotic resistance genes in the bacterial flora of a South American tribe that never before had been exposed to antibiotic drugs. The findings suggest that bacteria in the human body have had the ability to resist antibiotics since long before such drugs were ever used to treat disease. The research stems from the 2009 discovery of a …