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. 2023 Jan 5;26(3):357–369. doi: 10.1038/modpathol.2012.193

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© 2013 United States & Canadian Academy of Pathology.

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Phenotype of influenza A nucleoprotein antigen (InfA-NP)-positive cells. (a, e, i) InfA-NP immunoreactivity can be seen in red. (b) Immunoreactivity for surfactant apoprotein D (SP-D) in type II pneumocytes. (f) CD68 clone KP-1 in monocytes. (j) Cytokeratin (AE1/AE3) in bronchiolar epithelial cells. (c, g, k) Colocalization for each type is also presented. (d, h, l) TO-PRO-3 nucleic acid staining (blue) revealed the InfA-NP in nuclei. Original magnification, × 400.