Fig. 5

Photomicroscopy of the tongue showing mast cells (arrows). a - Large number of mast cells in the tissue (Animal of the SG group after 2 inhalation exposures of 2,4-D). b - Large number of mast cells in the tissue (Animal of the LCG group after 2 inhalation exposures of 2,4-D). c - Large number of mast cells in the tissue (Animal of the MCG group after 2 inhalation exposures of 2,4-D). d - Few mast cells in the tissue (Animal of the HCG group eight days after three nebulizations of 2,4-D). Hematoxylin-eosin, 400x magnification (100 µm bar for scale)