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. 2016 May 6;124(12):1870–1875. doi: 10.1289/EHP234

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Microglial morphology of rat olfactory bulb stained with anti-Iba1 antibody. Left, resting/ramified (R) microglia exhibiting thin, highly branched protrusions extending from the cell body; right, activated microglia (A) exhibiting amoeboid morphology with shorter, stouter processes. Left, rat treated with 110-nm silver nanoparticles 21 days post-exposure; right, rat treated with 20-nm silver nanoparticles 21 days post-exposure. Bar = 20 μm.