RB1 and retinoblastoma: In addition, the binding potential of EpDT3 and Scr-EpDT3 checked against RB fresh tumors, Y79 and WERI-Rb1, RB cells and Müller glial cells, showed 35% positive population in the retinoblastoma tumor cells (n=4) and the RB cell lines (Figure 2 and Figure 3).