Figure 5.

Cross sections of a granular layer in the cerebral cortex by PCNA staining. (A) Control, (B) 1 ppm, (C) 10 ppm, and (D) 20 ppm. PCNA-positive nuclei (arrows). Scale bars 10 μm.

Prasek et al. Nanoscale Research Letters 2013 8:251   doi:10.1186/1556-276X-8-251
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