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Detection of SARS‐CoV N protein by immunofluorescence. (A) Vero E6 cells infected by SARS‐CoV (×200). (B) Uninfected Vero E6 (×200); (C) 293 cells infected with adenovirus type 5 (×400). (D) MA104 cells infected by Group A rotavirus (×200). The green colour represents the positive signal for SARS‐CoV N protein, while the negative cells without SARS‐CoV infection display a red colour
