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(A) Knockdown of TDO2 decreased intrahepatic tumor metastasis of Huh7 cells in mice. (B) Inhibition of TDO2 by inhibitor 680C91 decreased intrahepatic tumor metastasis of Huh7 cells in mice. Photo micrograph of HE-stained tissues that showed metastasized HCC cell masses (magnification×4 and ×200, Scale bar = 200 mm). **P < 0.01.
