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. 2021 Jan 20;22:67. doi: 10.1186/s12864-020-07359-3

Fig. 1.

Fig. 1

Indirect immunofluorescence assay (IFA) of HD11 cells infected by IBV. Cells were fixed at the indicated time and infected with viruses, followed by immunofluorescence (IF) staining of IBV N protein (red). Cell nuclei were visualized by DAPI staining. Merge refers to an overlap of DAPI and NP (amplification: 200×). The histogram represents the ratio of relative intensity of red fluorescence (IBV N protein) to blue fluorescence (Nucleus)