Changes in nuclear and mitochondrial cfDNA in plasma 15–60 minutes after local heart irradiation. Red line represents the group average and standard deviation of the mean. Gray line represents values from an individual rat. Hearts from females (n = 10) were exposed to 3.5 Gy of X-radiation. Asterisks (*) represent a level of statistical significance compared with time 0 hours. Actual P-values are stated in the text.