According to OECD TG 407[OECD,2001b],rats were divided into 3 groups of 12 animals [6 maleand 6 female].The EJ-ext was administered to the first group of rats at the does of 1000 mg/kg/day for 14 days,whereas an equal volume of vehicle was given to the control group.In order to access reversibility,the EJ-ext at the does of 100 mg/kg was given once daily to third group of rats for 14 days, and kept foe another 14 days post-treatment.the toxic manifestation such as signs of toxicity,mortality and the body weight changes were mornitored daily.
Rats were anesthetied with ether on day 15.the heparinized blood samples were taken for determining complete blood count,red blood cell count,platelet count and red cell indicies.the serum from non-heparinized blood was carefully collected for blood chemistry and enzyme analysis.
all rats were sacrificed after the blood collection.the internal organs and some tissues were weighed to determine relative organs weight and observed for gross lesions.all tissues were preserved in 10% buffered formadehyde solution for histological examination.