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HeLa cells incubated at 37°C for 24 h in presence of 0.4 mg/mL of Na-POM-NH2 (Left) Na-POM-biot2 (Right), and stained with Atto 633-Streptavidin (red fluorescent signal). Nucleus stained by Hoechst 33342 (blue). Images acquired by a confocal light scanning microscope (CLSM). A similar signal was seen with a concentration of 0.2 mg/ml POM.
