<p>After administration of 3×10<sup>5</sup> B16F10 melanoma cells into the lateral tail vein,C57Bl/6 mice were treated intravenously with riboflavin or irradiated riboflavin 0.1 and 0.2 mg/kg, 6 times within 2 weeks. Mice were sacrificed 14 days after cancer cell injection and the number of tumor foci at the surface of the lungs was determined. The results are expressed as the mean ± SD (n = 8); * p<0.05, ** p<0.01 versus control.</p
