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Scattergrams to illustrate properties of spontaneously active C-fiber nociceptive units. Somatic AP durations and AHP depths in C-fiber units that did (filled circles) or did not (open circles) show spontaneous activity are plotted. Their medians were compared with the Mann–Whitney U test, both for units from untreated and from CFA-treated (2–4 d) animals. The AHP depth was measured from 0 mV (Fig. 1, 9). p valueasterisks as in Figure 3.
