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Influence of oxygen on tdTomato fluorescence. Fluorescence images of PC3-HRE-GFP/HRE-ODD-luc/tdTomato cells incubated at 21% O2 (normoxia), at 1% O2 for 48 hours, or at 21% O2 in the presence of 200 μM CoCl2 for 24 hours (CoCl2 200 μM 24 hours) to chemically mimic hypoxia.
