Feeding studies on rice genetically modified with soybean glycinin were performed on rats for four weeks. The rats were divided into three groups, each being fed on (I) only a com. diet, (II) this diet plus control rice and (III) this diet plus rice genetically modified with glycinin. The rats were fed with 10 g/kg-wt. of rice every day by oral administration. During the test period, the rats in every group grew well without marked differences in appearance, food intake, body wt., or cumulative body wt. gain. There were also no significant differences in the blood count, blood compn. or internal organ wts. among the rats. Necropsy at the end of the expt. indicated neither pathol. symptoms nor histopathol. abnormalities in the liver and kidney. Judging from these results, the rice genetically modified with glycinin is considered to have been essentially the same in nutritional and biochem. characteristics as the control rice.