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The following cell lines were used: CT26, a carcinogen-induced, undifferentiated colon carcinoma obtained from BALB/c mice (51); TS/A, a mouse mammary adenocarcinoma derived from BALB/c mice (52); MCA203, a C57BL/6-derived fibrosarcoma (53); and B16-GM, a C57BL/6 melanoma cell line genetically modified to secrete GM-CSF (54). cialis online canada . In vivo T cell cytotoxicity was determined 40 h later (Fig. About any prescription or nonprescription medications you are currently taking, including herbal and dietary supplements. viagra online pharmacy .