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Numbers of proliferating cell nuclear antigen (PCNA)-positive nuclei of cells in the brain cortex of embryos in the control group (n=3) and the groups treated with pristine graphene (pG) suspended in milli-Q water at the concentrations of 50 μg/L (n=3) and 500 μg/L (n=3) μg/L.
Note: *Values significantly different from each other, P<0.05.
