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Molecular bases of the control of the FLC gene expression by AGO1, COOLAIR RNA processing, and chromatin state. (Top) Expression of FLC, promoted by the THO/TREX complex, prevents flowering. (Bottom) AGO1 and FCA collaborate to promote repression of FLC expression through COOLAIR shortening and the replacement of permissive (H3K4me1) by repressive (H3K27me3) histone marks, which triggers flowering. Pol II, RNA polymerase II.
