NFATC4 and cardiac hypertrophy: In contrast, male C57Bl/6NT irradiated with 0.5 Gy 1H (1 GeV) show preserved cardiac function with progressive cardiac hypertrophy (increased LV posterior wall thickness and NFATc4 expression, an indicator of increased cardiac hypertrophy signaling) at 1-month post IR followed by a decline in cardiac function at 10 months.