Of all the proteins of the SARS-CoV-2 virus (the pathogen that causes COVID-19), the spike protein is the one that gets the most attention. This attention is well-deserved—the spike protein is essential for latching on to cells and infecting a host, and the three FDA-authorized vaccines against COVID-19 focus on the spike protein. While the initial invasion of a virus into a host is certainly an important step in the viral lifecycle, once inside the cell, the virus must replicate to survive. And that’s where the nucleocapsid protein, or N protein, comes into play.
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Source: Phys.org