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Capacity of bovine chromaffin cells to grow in vitro. (A and B) Double labeling for BrdU (brown nuclei) and PNMT (blue cytoplasm) of chromaffin cells from juvenile (A) or adult (B) cattle incubated for 72 h in the presence of 10% FBS. (C) Control section incubated in the absence of primary antibodies. (Scale bar, 50 μm.)
