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Effect of WS treatment on inhibition of lung metastasis in nude mice. HE staining of lung tissue sections after treatment with or without WS for 8 weeks (×20). (a) WS treated mouse lungs showed no tumor metastasis (n = 10); (b) six of ten mice showed tumor metastasis to the lungs, with a total of 12 metastatic foci in the blood vessels and the parenchyma of the lungs in control mice. WS: Withania somnifera
