S protein is the most important membrane protein on the surface of coronavirus, while N protein is another important structural protein in coronavirus. S protein and N protein are the key raw materials for COVID-19 immunodetection kits, which are of great value for the diagnosis and screening of novel Coronavirus. During the COVID-19 pandemic, serum antibody testing and antigen testing can complement nucleic acid testing, which can speed up screening and support the diagnosis of suspected cases.
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