Figure 4From: Noninvasive technique for measurement of heartbeat regularity in zebrafish (Danio rerio) embryosPoincare plot of time interval of heart beat from (A) control and (B) terfenadine-treated embryos at 52 hpf. X-axis is the time interval of heart beat at a particular time while Y-axis is the time interval of next heart beat. The shape and size of cluster illustrates the increase of heart beat variability in terfenadine-treated embryos.Back to article page