Table 1.

Damage index and damage frequency (Comet assay) in hemolymph of snails exposed to tobacco leaves or lettuce leaves (control group).

Exposure time (h)	Exposure group
	Control		Tobacco leaves
	Damage index	Damage frequency	Damage index	Damage frequency
0	56.80 + 34.53	29.90 + 14.16	60.00 + 22.98	29.00 + 10.88
24	53.60 + 36.76	28.30 + 17.34	166.80 + 45.29**, a	73.90 + 14.22**, a
48	96.60 + 41.18	44.50 + 18.11	207.60 + 48.52**, a	83.00 + 16.05**, a
72	97.50 + 38.55	45.60 + 17.78	224.10 + 42.95***, a	88.40 + 7.32***, a

The values are the mean + SD of 10 snails per group.

^**p < 0.01 and

^*p < 0.001 compared to the corresponding control parameter (Students t-test).

^ap < 0.05 (24 h) and p < 0.001 (48 h and 72 h) compared to 0 h (Kruskal-Wallis test).