Among many animals, such as mice, fruit flies, and humans, each odour that an animal can smell is detected by a particular kind of sensory neuron that has a particular kind of receptor; eliminating that 『eceptorthrough illness or genetic manipulation results in the inability to smell that odour. Recently, researchers at Dun College have bred a mosquito with a genetic defect they believe will affect the insect's blood-smelling 『eceptor neuron. Therefore, in a situation in which the insects are deprived of their sight, they should be unable to detect a human to bite. Experiments testing this hypothesis begin this week.