Histochemistry for mast cells in WT and CF mouse stomach and small intestine.

Sections were stained with toluidine blue and mast cells identified by their metachromatic staining. (A) Wild type stomach; (B) CF Stomach; (C) Wild type small intestine; (D) CF small intestine. Arrowheads indicate mast cells. Representative from 7 WT and 7 CF stomachs.