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Growth inhibition of tumour cells by conditioned medium of RAW264.7 cells treated with oligodeoxynucleotides (ODN). Conditioned medium of ODN-treated RAW264.7 cells was added to B16-BL6/Luc cells, and the cells were cultured for additional 48 hr. Then, the number of cells was determined by measuring the luciferase activity of cell lysates. Results are expressed as the mean ± SD of three determinations. *P < 0·05, **P < 0·01, significantly different from other conditions.
