Fig. 5.

Histamine immunoreactivity/mast cell density increases in atrial intrinsic cardiac ganglia postmyocardial infarction. Cardiac ganglia from control and CMI animals were labeled with an antibody to histamine (rabbit anti-histamine, 1:500; and donkey anti-rabbit FITC, 1:500), which is localized in cardiac mast cells. The density of mast cells was increased in the atrial ganglia tissues derived from CMI animals compared with control animals. These atrial tissues are not in the perfusion bed of the infarcted tissue. Scale bar, 50 μm.