Table 3. Evaluation of 8-hydroxydeoxyguanosine in the small intestine.

Group	8-OHdG-positive cells*
Untreated°	21.9±0.8
Histamine#	21.4±1.5
Untreated-5 Gy§	46.7±4.9a
Histamine-5 Gyˆ	7.5±0.8a,b

^*The percentage of 8-hydroxydeoxyguanosine (8-OHdG) immunoreactivity in cryptal cells expressed as mean ± SEM of 10 fields examined.

^°Representative of small intestines from at least eight saline-treated rats.

^#Representative of small intestines from at least eight 0.1 mg/kg.day histamine-treated rats;

^§Representative of small intestines from at least eight saline-treated and 5 Gy-irradiated rats;

^ˆRepresentative of small intestines from at least eight histamine-treated and 5 Gy-irradiated rats.

^aP<0.001 vs untreated,

^bP<0.001 vs untreated-5 Gy (ANOVA and Tukey Post test).