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Control rats showed low amount of mast cells in LV of heart (a). However, ISO administration increased degranulated mast cell infiltration in LV of heart which was significantly reduced in allopurinol treated rats. Toluidine blue staining showed mast cells infiltration (deep blue dots) in heart of rats treated with ISO. (a) Control; (b), ISO; (c) ISO + allopurinol, magnification 40x.
