VP2 gene did not changed any more from CEF-10 to CEF-20 generation.
以后的细胞适应毒至20代，其VP2基因序列不再改变。
Conclusion: The recombinant protein of VP2 has better antigen activity.
结论：VP2重组蛋白具有良好的抗原活性。
If the fusion protein of VP1 and VP2 that was expressed in E. coli can form neutralizing antigen epitopes, this problem is resolved.
如果大肠杆菌中表达的VP1和VP2融合蛋白也能形成中和抗原表位，则解决了这个问题。
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