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By Amy Maxmen of Nature magazine Researchers have identified a gene that makes some strains of an antibiotic-resistant bacterium more virulent, and have found that the gene is becoming more prevalent. Epidemics of infection with methicillin-resistant Staphylococcus aureus (MRSA) come in waves. [More]

You might call it the one night stand gene. A minor tweak of the gene that maps out a receptor for the feel-good neurotransmitter, dopamine, may be all it takes to explain the promiscuous beats of the cheating heart