Figure 3. The MMP9 and IL6 gene expressions are elevated in KC, and the mRNA levels of MMP9 and IL6 were measured in the corneal epithelia of 52 control and 90 KC samples. The relative expression values for (A) MMP9 and IL6 in the control versus KC; (B) The MMP9 and IL6 mRNA levels stratified by clinical grades of KC.