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Figure 3 Representative histologic sections stained with hematoxylin-eosin of common carotid arteries, removed 14 days after angioplasty, from (a) a normal rat (no balloon injury); (b) a control rat subjected to only balloon injury; (c) rats included in Protocol I; (d) rats included in Protocol II; (e) rats included in Protocol III; (f) rats included in Protocol IV. The 8-Cl-cAMP reduced significantly the neointima formation after balloon injury (c, d, e).
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