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Imitating specific features of organisms is one of the most important aspects of bionic biological science.Such features are achieved by proteins expression,which are originally encoded by diverse genes.Thus,the studies of gene functions are very important to bionic biology.In recent years,associated with the development of gene function studies,numerous gene expression systems have arisen.Since the direct process of most natural proteins acquisition usually remains limited,exogenous gene expression systems are the main systems utilized to obtain targeted proteins.