我们正在尝试各种可能性，试图激起针对病毒不变异部分的免疫反应。
Various possibilities that trigger an immune response against the parts of the virus that don't mutate are in the works.
大型纠正效果设定值保持不变免疫供应压力变化。
Large correcting effect maintains constant setpoint immune to supply pressure variations.
在90、180、480日龄，鸡间脑内胆碱乙酰转移酶免疫反应阳性产物密度具有五种变化趋势：①保持不变的仅有内侧缰核；
There were five kinds of changing tendency of the density of ChAT-IR positive products in 90,180 and 480 days chicken.
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