FIG. 7.
(a) Graphical representation of fluorescence intensities from all cells in the field of view. Electrical stimulation at 10 and 1 V/cm increased cytoplasmic Ca2+ after an initial stimulation at 100 V/cm for 5 min. (b) Percent increases in cellular fluorescence in three equivalent experiments in which cells were stimulated electrically at 100, 10, and 1 V/cm at 1 Hz for 5 min, in that order. Cells remained as responsive to electric field stimulation after an acute stimulation at 100 V/cm as they were when the order was reversed, that is, from low to high field strength. Color images available online at www.liebertonline.com/ten.