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. 2018 Dec 20;13(12):e0209479. doi: 10.1371/journal.pone.0209479

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© 2018 Cordes 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 credited.

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Fig 2 — Representative immunohistochemical staining of β1 integrin (A), FAK and phosphorylated FAK (pFAK) (B), associated ECM proteins (C), proliferation markers and HPV/p16 (D) in HNSCC specimens, including negative controls. Immunochemistry was performed on paraffin embedded tissue microarrays (TMA). A shows the four different β1 integrin expression scores (0 = absent; 1–3 increasing. B shows only score 3 stainings relative to the negative control. Magnification is x20 for all photographs.