Figure 3. Putative stem/progenitor cell marker expression, ABCG2. A: Quantitative PCR expression levels of ABCG2 in limbal, conjunctival, and oral cultured cells from day 0 and day 14 cultures. Results were normalized with β-actin. All experiments were performed in triplicate using six samples per group (limbal, conjunctival, and oral). B: Representative fluorescent activated cell sorting (FACS) analysis of ABCG2-positive population in limbal, conjunctival, and oral cultured cells from day 14 cultures. C: Summarizing graph represents the results of the FACS analysis of ABCG2 in the limbal, conjunctival, and oral cultured cells, performed in triplicate. Significance denoted, p *<0.05, **<0.01, ***<0.005.