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The viability of primary astrocytes (a predominant cell type of the brain) extracted from the newborn rat midbrain is unaffected by the incubation with polymer nanotubes (a). Light microscopy analysis shows a heavy coverage of the nanotubes on the astrocytes ((b) = MWNT, (c) = “Small” polymer nanotubes, (d) = “Large” polymer nanotubes) at the highest concentration analyzed (240 μg/ml) (scale bars = 100 μm, n = 4).
