Cellular RNA was labeled by adding ethynyl uridine (EU) to the medium. Subsequently, the cells were fixed and permeabilized with 4% paraformaldehyde and 0.1% Triton X-100. Chemical labeling of the EU with a fluorophore-containing RNA was performed by click chemistry according to the manufacturer’s protocol (Jena Bioscience, Germany). Cells were analyzed by FACS analysis according to standard procedures.
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