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Concentration-depended cytotoxic effects of the oils of (A) P. heldreichii twigs, (B) P. heldreichii needles, (C) P. peuce twigs, (D) P. peuce needles, (E) P. mugo twigs, (F) P. mugo needles and (G) P. mugo cones on the three cancer cell lines HeLa, CaCo-2 and MCF-7, using an MTT-assay.
