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The integrity of myocardial cells was ill-preserved in human samples (A–C), however, nanosized particles could be seen in luminal red blood cells (RBC) (arrows on RBC in A–C) and in adjacent endothelial cells (EC) (arrow on EC in B) of an 11 years old MCMA girl (arrows point to the nanosized 14 nm in diameter particles). Luminal microfragments (MF) of unidentified cell origin are also common (B). Magnifications ×36,400. Scale bar = 500 nm.
