Those fruit flies are pickier than you think

On your kitchen counter, it might seem as though fruit flies will show up for just about any type of fruit you leave around for them. But when given a choice about where to lay their eggs, those flies will go for citrus most of the time, new work shows. The basis for that seemingly complex food preference is surprisingly simple, according to a report in the Cell Press journal Current Biology on December 5. It boils down to a single odorant receptor found on a single class of sensory neurons.

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