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In trypanosomes, mRNAs are processed by spliced leader (SL) trans splicing, in which a capped SL, derived from SL RNA, is spliced onto the 5′ end of each mRNA. This process is mediated by the spliceosome, a large and dynamic RNA‐protein machinery consisting of small nuclear ribonucleoproteins (snRNPs) and non‐snRNP proteins. Due to early evolutionary divergence, the amino acid sequences of trypanosome...