Experiment two: Before the execution, India ink 1:3 diluted with germ free physiological saline (0.25ml/100g) was injected into the vail vein in each group rats.

• 实验二在处死动物前各组经鼠尾静脉注射用生理盐水1:3稀释的印度墨汁(0.；25ml/100g)。