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Human retinoblastoma tumors exhibit immunoreactivity to human embryonic stem cell markers Oct 3/4 and Nanog. A: Human retinoblastoma (RB) tumors were prepared as frozen sections, and immunostained for human embryonic stem cell markers AlkPhos, Oct3/4, and Nanog, Immunoreactivity to Oct3/4 and Nanog was evident (eg. arrows), while no reaction was seen AlkPhos. B: Human testicular seminoma tissue (TS) was used as a positive control for Oct3/4 and Nanog. The scale bars represents 5 μm.
