Figure 2. Percentage positivity of putative cancer stem cell markers in primary retinoblastoma (RB) tumors. A: Representative scatter plot shows 61.24% of epithelial cell adhesion molecule (EpCAM) positive cells in the RB tumor. B: Representative scatter plot shows 63.67% of cluster determinant (CD)44 positive cells in the RB tumors. C: Representative scatter plot shows 63.67% of CD24 positive cells in the RB tumors. D: Representative scatter plot shows 1.5% of ATP binding cassette protein G2 (ABCG2) positive cells in the RB tumors. EpCAM-FITC represents EpCAM⁺ cells identified using fluorescein isothiocyanate (FITC) labeled antibody. CD44-PE represents CD44 positive cells identified using phycoerythrin labeled antibody. CD24-APC represents CD24 positive cells identified using allophycocyanin labeled antibody. ABCG2-FITC represents ABCG2 positive cells identified using FITC labeled antibody.