Mouse anti-SARS-CoV & CoV-2 NP mAb recognizes SARS Coronavirus Nucleocapsid protein (NP). Coronavirus NP localizes to the cytoplasm, and the nucleolus in both Virus-like particle (VLP) infected primary cells and in cells transfected with NP plasmid. NP has abundant expression in coronavirus and is a highly immunogenic phosphoprotein . NP is also conserved in sequence. Due to these characteristics above, the NP is an ideal marker for diagnosis.