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Immunoelectron microscopy. Simultaneous PAM (10-nm gold) and ACTH (15-nm gold) staining in tubular structures in the TGN (arrows) and rounded structures (arrowheads) in PAM-1 cells (A and C) and PAM-1/K919R cells (B). Scale bars, 0.5 μm (A and B); 0.25 μm (C).
