The characteristic feature of neuropathic pain is the development of cold allodynia against non-painful (non-noxious) cold stimuli, including acetone. Using micropipette, acetone (100 μL) was applied (from below of the wired mesh) on the plantar surface of the hind paw. The duration for which the animal withdrew its paw was noted in seconds. This test was done three times with an interval of 5 minutes, and the cumulative paw withdrawal duration was noted [34].
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