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Explanted pericardium with von Kossa staining. Samples were implanted into rabbit intramuscle for 4 or 8 weeks. In particular the GA-PEG group showed a very low degree of calcification (0.62±0.1 μg/mL/mg). These results can be observed with the von Kossa stain. Light microscopic image of bovine pericardium (original magnification ×40).
