Figure 1. Relative expression of cytokeratins (KRTs), p63, and ABCG2 genes. Real time PCR was performed in 24 samples of limbal and corneal epithelial cells. Mean mRNA expression in limbal epithelial cells was expressed relative to that corneal epithelial cells. Positive values indicated relatively greater expression in limbal cells, while negative values indicated relatively less expression in limbal. Significance was analyzed by Student’s t-test. *p<0.05, **p<0.001, ***p<0.00001.