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ALA rescues Hh signaling in SGs after irradiation. Sprague–Dawley rats were subjected to 18 Gy radiation in the head and neck region. SGs were collected at each time points, and RNA was extracted and subjected to qPCR analysis of Shh and Ptch expression. N = 12–16 SGs/group. Values are represented as the mean ± SEM. *p < 0.05.
