本工作用雌性大白鼠进行实验、实验分为三组。 一组实验:将雌性大鼠与雄性大鼠合笼后,次晨阴道涂片中发现精子作为妊娠的第一天。将动物分为几组,分别于孕4日,孕5日或孕7日的上午,按Noble氏法进行侧脑室注射。实验组动物于侧脑室中注入 This work with female rats for experiments, the experiment is divided into three groups. One set of experiments: After the female rats were mated with male rats, the sperm was found in the next morning vaginal smear as the first day of pregnancy. The animals were divided into groups, respectively, on the 4th of pregnancy, 5th of pregnancy or 7th of the morning, according to Noble’s method for intraventricular injection. Experimental animals were injected into the lateral ventricle