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. 2011 Dec 15;35(1):153–158. doi: 10.1590/s1415-47572011005000060

Table 1.

DNA damage in CHO-K1 cells exposed to metformin, as measured by comet assaying.

Treatments	Cell with DNA damage (%)	DNA damage (%)
Negative control	24.53 ± 13.08^a	16.26 ± 7.18^a
Positive control	95.88 ± 1.06^b	89.43 ± 5.79^c
Metformin 114.4 μg/mL	86.77 ± 4.72^b	64.12 ± 7.03^bc
Metformin 572.0 μg/mL	73.77 ± 12.46^b	41.74 ± 9.23^ab

^{a, b, c}

Different superscripts in the same column denote significant differences (p < 0.05).