Interesting info. regarding the N protein https://www.technologynetworks.com/diagnostics/blog/covid-19-antibody-testing-s-vs-n-protein-340327 Coronavirus has four main structural proteins: nucleocapsid (N), spike (S), membrane (M) and envelope (E). The S protein consists of the S1 and S2 subunits. The S protein is highly immunogenic since it is located on the surface of the virus. The N protein
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