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介绍了甲病毒表达系统，包括载体和用于包装的辅助系统的构建，以及该系统在异源基因表达和核酸疫苗研究中的应用
The alphavirus expression system was introduced, including the construction of vectors and the helper system for packaging, and the application of the system in heterologous gene expression and nucleic acid vaccine research