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Total number of pre-neoplastic lesions (PNL) counted on the surface of livers of rats undergoing the ‘resistant hepatocyte’ model. Values represent the total number of nodules in all animals; experimental rats were treated with 10% Comfrey extract, po. *Mann–Whitney test, P = 0.0464 (U = 57.000); #Mann–Whitney test, P = 0.0037 (U = 65.000).
