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(a) in the control group (most chromaffin cells have high TH content in the cytoplasm); (b) in rats exposed to low doses of DDT in the prenatal and postnatal periods (decrease in TH content in chromaffin cell cytoplasm); (c) exposure only in the postnatal period (most chromaffin cells do not contain TH); Mayer’s hematoxylin staining; ×400
