Fig. 1.
(A) KCl-evoked cytosolic calcium transient in postnatal day 7 (P7) and adult rat dorsal root ganglia neurons. The peak height of the change in cytosolic calcium (i.e., difference between the peak level upon KCl stimulation and the baseline level) was compared. The change in intracellular calcium was expressed as change in peak fluorescence intensity relative to the cross-sectional area for each cell (F/A). Two-tailed unpaired t test was used. Sample size (number of neurons) is indicated above each bar (three cultures per age group). (B) Frequency distribution histogram for cross-sectional areas of P7 and adult dorsal root ganglia neurons treated with 100 mm KCl, represented as percentage of total examined P7 or adult dorsal root ganglia neurons in this experiment.