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. 2014 Jun 23;9(6):e100619. doi: 10.1371/journal.pone.0100619

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© 2014 Forberg et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Lung tissue sections from animals infected with influenza A virus (n = 12) were stained with immunofluorescence markers against (A) NKp46(green), (B) influenza A NP(red) and (C) the apoptosis marker caspase-3(blue). (D) Overlay displaying simultaneously influenza A virus NP⁺ and caspase-3⁺ cells as purple (arrows). Representative of virus infected bronchiole at day 1 pi. Immunofluorescence staining, 400x.