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. 2014 Feb 14;122(6):559–565. doi: 10.1289/ehp.1307832

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Immunofluorescent staining for Runx2 (top) and pERK (bottom) in bones of rats administered 0, 0.05, or 0.5 ppm As₂O₃in drinking water for 12 weeks. Bars = 20 μm. Photomicrographs are representative of at least three independent experiments (4 rats/group).