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Apoptosis in the hearts of neonatal mice 7 days after infection with the myocarditic reovirus strain 8B. (A) TUNEL staining (left) and staining for active caspase 3 (right). (B) Positive staining for active caspase 3 in cardiac myocytes (white arrows). A negative fibroblast is also shown (black arrow). From DeBiasi et al. (35) with permission.
