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Fig. 3. Radiation-induced apoptosis of mammary epithelium varies during post-natal development. The percentage of apoptotic cells in mammary epithelium and intramammary lymph nodes was measured by TUNEL assay on BALB/c-Trp53+/+ mammary tissues before (control) or 6 hours after (irradiated) treatment with 5 Gy of whole-body {gamma}-radiation at various stages of post-natal development. Asterisks indicate values significantly different from unirradiated controls (P<0.05). Error bars represent s.e.m.