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STAT3 structural domains and phosphorylation sites. The phosphorylation of Tyr705 by JAK, SRC, RTK, PIK3CA, and others activates the transcriptional ability of STAT3, whereas Ser727 phosphorylation in response to ROS or by MTOR, MAPK1, and others mediates the mitochondrial localization or enhances the transcriptional potential of STAT3.
