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Optical microscopy photographs of hASCs exposed for 24 h to micro and nanoparticles and stained with haematoxylin-eosin solution. Micro- and nanoparticles are visible as black corpuscles. FeMPs (a), FeNPs (b), CoMPs (c), CoNPs (d), NiMPs (e), and NiNPs (f). All cells maintain the classical fibroblast-like morphology. Original magnification: 20×. Bar indicates 40 µm.
