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RER ultrastructure in AVICs populating 7-day-long-implanted pAVLs. (A) Enlarged RER cisternae (circle) in a mineralizing cell showing electrondense PPM and disappearance of nuclear envelope (counterposed arrowheads; N: nucleus). (B) Magnification of the cytoplasm area encircled in (A) showing release of ribosomes from dissolving RER membranes and melting with the nearby PPM (arrowheads). Bar: 0.5 μm.
