Fig. 1From: Identification and analysis of long non-coding RNAs and mRNAs in chicken macrophages infected with avian infectious bronchitis coronavirusIndirect 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)Back to article page