Table 1.

Parameters of [Ca²⁺]_i or K⁺ current oscillation in PDEC

	Duration (s)	Number of peaks	Period (s)	Percentage of oscillatory cells
Ca2+ oscillation in intact cells
2 μm UTP	234 ± 24	12 ± 2	19 ± 0.7 *	93 (14/15)
10 μm UTP	181 ± 31	11 ± 2	17 ± 0.9	50 (6/12)
2 μm ATP	196 ± 33	11 ± 2	17 ± 0.7 *	100 (5/5)
10 μm ATP	177 ± 29	12 ± 2	15 ± 0.4	57 (4/7)
Current oscillation in perforated whole-cell configuration
2 μm UTP	413 ± 30	17 ± 4	28 ± 7.5	67 (4/6)
10 μm UTP	470 ± 55	21 ± 3	24 ± 4.0	100 (4/4)
Current oscillation in ruptured whole-cell configuration
2 μm UTP	209 ± 35	9 ± 2	23 ± 1.0 *	88 (14/16)
10 μm UTP	161 ± 24	9 ± 1	18 ± 1.3	42 (5/12)

Duration and number of peaks were defined as total time lapsed and the total number of peaks between the first and the final peaks. Period was calculated by dividing the duration by the number of peaks in each experiment. Only cells showing oscillations were included in the analysis.

^*Asterisks (P < 0.05) indicate that parameters at 2 μm UTP or ATP in same condition are significantly different compared with the values at 10 μm. Data are means ± s.e.m.