Measurement of calcium release by young and mature thrombocytes. The left picture panel shows 3 rows of timed images of ADP-induced calcium release monitored by OG fluorescence of a single DiI-labeled thrombocyte. The top row of this panel has images taken at 5, 15, 25, 35, and 45 seconds; the middle row has images taken at 55, 65, 75, 85, and 95 seconds; and the bottom row has images taken at 105, 115, 125, 135, and 145 seconds, as shown from left to right, respectively. The intensities from these images were plotted (red diamonds) on the graph in the right panel. Arrows show the time of ADP addition. Green squares indicates the unlabeled thrombocyte for which the timed images are not shown.