153568.fig.004a
(a)
153568.fig.004b
(b)
Figure 4: Mast cell degranulation. The dorsal skin excised at the end of the experiment was fixed in formalin, microtomed in 4 μm sections, and stained with acidified toluidine blue. The number of mast cells/unit area of dermis in 4 sites chosen at random was counted. (magnification, 400x), arrow heads showing degranulated mast cells.