Genes guide the synthesis of protein, so the preparation of protein drugs comes from genes for certain diseases. These processes need many steps (very complicated), such as tool enzymes, modification and isolation of target genes, introduction of recombinant genes into recipient cells, expression and regulation of foreign genes, etc. Just to get the gene to treat a disease, and then use the principle of genetic engineering to amplify the DNA fragment, amplify it to RNA, and then amplify it to protein.