Rats were immunized with sheep red blood cells (SRBC). On 3-6 days after immuuization,the changes of acetylchohlinesterase (AChE) activity in the hypothalamus, thalamus, mesencephalon and pons were determined by colorimetry.

• 用绵羊红细胞（SRBC）免疫大鼠，在免疫后第3天至第6天，分别检测大鼠下丘脑、丘脑、中脑和脑桥内乙酰胆碱酯酶（AChE）活性的变化。