Nonstructural proteins NS2 and NS3 are present as diad NS2-3 in wildtype noncytopathic CSFV. NS2 gene is deleted together with all upstream coding regions in CSFV DI particles, and diad NS2-3 is changed to NS3 monomer.

• 野生型CSFV非结构蛋白NS2和NS3以二联体形式NS2-3存在，而在干扰缺损颗粒中，NS2基因连同上游的全部编码区被缺失，NS2-3二联体变成NS3单体。