Histochemistry, cytochemistry, and immunohistochemistry of V3 mast cells in the lymph nodes of mastocytosis mice. The V3 mast cells in the various tissue sections that have multi-lobular nuclei were evaluated for the expression of c-kit (b) and for methylene blue reactive granules (a) that contain chloroacetate esterase enzymatic activity (c), mMCP-5 protein (d), mMC-CPA protein (e), mMCP-6 protein (f ), and AAK enzymatic activity (g).