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. 2017 Feb 16;65(4):347–353. doi: 10.1007/s00005-017-0455-9

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© The Author(s) 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 2 — Relative osteopontin (OPN) expression in peripheral blood mononuclear cells (PBMCs) determined by RT-PCR (mean). Experiments were performed on phorbol myristate acetate (PMA) plus ionomycin-stimulated and unstimulated PBMCs after incubation with sildenafil (at a concentrations of 400 ng/ml and 4 µg/ml)