We can edit virus antibody to make immunoglobulin fusion protein. In gene operation, some polypeptide genes with small molecular number are often connected with a gene (such as LAC) by fusion, and a cut of an enzyme (such as thrombin) is connected between them, so as to increase the stability of the product after expression in vivo. Some deliberately make two molecules fuse in tandem to improve the stability of the product High efficacy, such as IL-3 and GM-CSF. There are also fusion genes with signal peptide genes of secretory proteins to secrete the expressed products out of the membrane or out of the cell.