C-fiber nociceptors can be divided into two groups based on growth factor dependency and isolectin B4 (IB4) binding. IB4-negative nociceptors have been proposed to contribute to inflammatory pain. Since the TRPV1 receptor is critical for inflammatory heat hyperalgesia, we hypothesized that inflammation would sensitize IB4 negative but not IB4-positive small-diameter neurons to TRPV1 stimuli. Two days after complete Freund's adjuvant (CFA)-induced inflammation in the hind paw of mice, lumbar 4/5 ganglia were dissociated and small-diameter (
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