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Electron micrographs demonstrating the presence of K5 antigen in BCBL-1 cells. Immunogold labeling (arrows) is detected only on membranes of endoplasmic reticulum-like structures (A and B) but not in a nucleus (N) and mitochondria (M). Immunogold labeling was performed using cryo-thin sections (gold particles, 5 nm in diameter). Original magnifications: A, ×57,000; B, ×60,000.
