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Hydrogen induces tumor tissue apoptosis in tumor-bearing mice. (a) TEM photos of the tumor tissues at various scales; (b) H&E images of tumor tissues dissected from each group after different treatments on day 24; (c) Apoptosis was analyzed by TUNEL staining in tumor tissue after 24 days of treatment; (d) Confocal laser scanning microscopy of caspase-3 staining in tumor tissues after different treatments.
