Table 1. Experimental design and time table for treatment.

Days
	2	1	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14
ALA	√	√	√
Radiation			√
Sampling						√				√							√

Thirty-nine BALB/c mice were randomized to four groups: i) control group (9 mice), ii) ALA group (9 mice), iii) RT group (11 mice), and RT + ALA group (10 mice). Small intestine damage was induced by irradiation (15 Gy, 1 fraction) on the abdomen. In the ALA group, mice received 100 mg/kg/day ALA by intraperitoneal injection on days −2 to 0. The control group received vehicle in the same way. The small intestine was collected 3rd, 7th, and 14th days after irradiation.