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This little industry news article walks through how some researchers identified the channel proteins underlying a skate's (similar to a ray) electrosensitivity, which allows it to find prey buried in sand or otherwise obscured (heartbeats make weak electrical signals the animals can detect).
Their approach starts with behavior, and then goes through neurophysiology, molecular biology, and pharmacology to nail the down the channels involved in this unusual sense.
Their approach starts with behavior, and then goes through neurophysiology, molecular biology, and pharmacology to nail the down the channels involved in this unusual sense.