(A) The top row shows the [Ca]i wave after insemination of albino Xenopus eggs, whereas the second and third rows show the [Ca]i in the presence of the PLD inhibitors FIPI (10 μM) or 1-Butanol (0.75%). The bottom row shows cells treated with the control 2-Butanol (0.75%). The time for the determination is noted under each image (note the variance), and the highest [Ca]i is represented by red, next by green, and blue represents the lowest [Ca]i. (B) Pixels of [Ca]i images from multiple experiments (numbers in the columns represent different cells) were summarized to show that (top) FIPI slowed the initiation of the sperm-induced calcium wave, and (bottom) reduced the size of the [Ca]i increase (measured by recording relative changes from basal to peak fluorescence). The carrier for FIPI (1.3% DMSO) did not affect either time to wave initiation or maximal [Ca]i. (C) As compared to controls, 1-Butanol delayed the wave initiation and reduced the size of the [Ca]i increase. 2-Butanol had no effect. One asterisk denotes a P < 0.03 whereas two signify P < 0.0001.