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CTD phosphorylation. (A) Kinases that phosphorylate the CTD in vertebrates (top) and in S. cerevisiae (bottom). Additional CTD kinases have been described but are not depicted here for simplicity. For clarity, only a single heptad repeat is shown. (B) Relative levels of the different CTD residues along the body of genes in S. cerevisiae. Created with BioRender.com.
