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Vascular density six weeks after 5 × 15 Gy radiotherapy. The average vascular density by immunohistochemistry with CD31 in the skin (a), the muscle (b) and the submandibular gland (c) of control (n = 5) and irradiated (n = 5) animals presented as mean ± SD. *indicates p < 0.02 and **indicates p < 0.01 by an unpaired, non-parametric Mann–Whitney test
