Correlation between testis weight (mg) and time (days) after irradiation. The testes of mice were locally exposed to radiation with 1 Gy (black columns) or 2 × 1 Gy with an interval of 7 days (light grey columns). The testes were weighted and sampled on the indicated days. For 2 × 1 Gy the days correspond to days after the second dose. Error bars represent standard deviation of the mean of the testes (n = 2-8) removed at the indicated day.