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Dermal photoreceptors in the pond snail Lymnaea stagnalis mediate the whole-body withdrawal response, including pneumostome closure, elicited by a shadow passing over the pneumostome area. The pneumostome closure response is part of the defense reaction in Lymnaea. The shadow or ‘light-off’ stimulus elicits activity in a higher order interneuron, RPeD11, which has a major role in mediating defensive...
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