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Immunofluorescence staining of macrophages (A) and MDCK cells (B) at 6 and 24 h postinfection with JS08 (clade 2.3.4), AH05 (clade 2.3.4), HB07 (clade 2.3.2), or SY08 (clade 7). Influenza virus nucleoprotein was detected with a fluorescein isothiocyanate-conjugated mouse antibody (left column at each time point). Nuclei were detected with 4′,6-diamidino-2-phenylindole (right column).
