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Effects of exogenous H2S on the PI and MVD of human thyroid carcinoma xenograft tumors. (a–c) Representative photographs of HE, Ki67, and CD31 staining in TPC-1, TT, and ARO xenograft tumors; original magnification ×400. (d, e) The PI and MVD were calculated (n = 6). ∗P < 0.05, ∗∗P < 0.01 compared with the control group.
