integument
• puritogen-induced itch is absent
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nervous system
behavior/neurological
• in response to formalin
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• mice exhibit increased reflex withdrawal thresholds in the von Frey test of mechanical pain compared with wild-type mice
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• mice exhibit high response latencies in a hot plate test compared with wild-type mice
• however, mice exhibit normal response in the Hargreaves and tail immersion reflex withdrawal tests
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