we used transmission electron microscopy to quantify the distances between mast cells and neural processes ( nerve terminals or axons ) in the small intestinal mucosa , right atrium , skin , and pulmonary parenchyma of normal rats , and in the small intestinal mucosa and lung parenchyma of rats that had undergone hyperplasia of the mast cell populations in these sites as a result of infection with the nematode nippostrongylus brasiliensis .
C0024880
mast cells
C0024899
hyperplasia