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Xenograft tumor studies. a-c T24 cells transfected with NC or sh-circ0001944 were subcutaneously injected into nude mice, and tumor growth curves and tumor weight were plotted. Data are presented as mean ± SD; **P < 0.01, ***P < 0.001 vs. NC. d Immunohistochemistry showing the percentage of Ki-67-positive cells. e-g RT-qPCR detection show the expression of hsa_circ_0001944 (E), miR-548 (F) and PROK2 (G) in tumor tissues. Data are presented as mean ± SD; ***P < 0.001 vs. NC
