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A, Mean proportion of SPR immunoreactive lamina I cell bodies exhibiting more than five SPR immunoreactive endosomes per SPR immunoreactive lamina I cell body as a function of stimulus intensity. B, Mean (±SEM) number of SPR+ endosomes per cell body in SPR immunoreactive lamina I neurons. In both cases the thermal stimulus group was compared with the 32°C contralateral control group, and the neurons sampled were present in the medial aspect of the rat L4 spinal segment. *p< 0.05.
