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Post-embedding von Kossa silver staining of ribosomes in mineralizing AVICs. (A) Silver particle precipitation onto free ribosomes and those associated with RER membranes in a bAVIC at early calcification stages. (B–D2) Silver particle precipitation onto ribosomes associated with membranes lining enlarged RER cisternae or released nearby in hAVICs affected by ongoing calcific degeneration. Bar: 0.25 μm.
