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Cell viability of L929, R 1610, A549, and M109 cells after exposure to free-CDDP, free-PTX, CDDP-FA-NPs, PTX-FA-NPs, free-CDDP + free-PTX, Co-NPs (CDDP: PTX = 1:2), and Co-FA-NPs with different ratio at 37° for 24 hours. The total drug contents in all groups were kept at 10.0 μg/mL for all tests, *p < 0.05 and **p < 0.01 compared with free-CDDP group. ## indicated that the p < 0.01.
