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Date Time Why male mosquitoes leave humans alone A side-by-side comparison of the fruitless gene in the female (left) and male (right) mosquito brain. Male mosquitoes won’t bite you. For one thing, they cannot-males are hopelessly bad at finding humans and lack a specialized stylet to pierce your skin. But even if they could bite you, they would not want to. They refuse blood meals served to them in the lab through netting, even as their female counterparts engorge on what must appear to be a free lunch. Now, a new study from the laboratory of Rockefeller’s Leslie Vosshall helps explain why. It appears that both mosquito sexes share the same neurons and brain structures needed to find humans, but that this hardware is hidden in the male mosquito brain, locked behind a simple genetic switch. Mutate the right gene, the researchers discovered, and male mosquitoes begin buzzing toward human scents in search of a prize that they do not even want. ....