Figure 2. Variables of aequorin luminescence measured in this study. (A) Mean diastolic aequorin luminescence. (B) Peak systolic aequorin luminescence. (C) Time to peak luminescence. (D) t¹.25, time from peak aequorin luminescence to 25% of peak aequorin luminescence. k⁵⁰/10 - slope of natural logarithm of aequorin luminescence between 50% and 10% of peak during the decline of the aequorin signal.