Figure 2

Infiltration of MHC class II⁺, ED1⁺, and OX19⁺mononuclear cells in the tongue from the control rats and the mercury-treated rats. Cells were counted from day 0 (d0) to day 21 (d21). The tongues from control rats are represented by black columns (n=3 per day), the tongues from mercury-treated rats are indicated by white columns (n=5 per day). Cell numbers/ mm² indicated as mean± standard error (SE). *, significantly different at p< 0.01 compared with control. **, significantly different at p< 0.005 compared with control. There are no significant differences in groups of white columns jointed to horizontal bars are at a p value of <0.05.