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Figure 4: Morphological change of primary cardiac myocytes induced by TiO2 particles. The primary cultured cardiac myocytes of rat exposed to 50 (b), 100 (c), and 150 (d) μg/mL anatase TiO2 nanoparticles or 50 (e), 100 (f), and 150 (g) μg/mL rutile TiO2 nanoparticles for 2 days. (a) represents the control cells. Scale bar is 50 μm.