Figure 1

Changes in the [Ca²⁺ ] _i of cat oocytes induced by different stimuli. The upper part of each section shows cytoplasmic free Ca²⁺ levels as detected by a photometer; the arrows indicate the time when the stimulus was applied. In the lower part of each section images of [Ca²⁺ ]_i changes in individual cat oocytes are shown; different colors indicate different intracellular free Ca²⁺ concentrations.