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Structural and functional analysis of proteins involved in pre‐mRNA splicing is challenging because of the complexity of the splicing machinery, known as the spliceosome. Bioinformatic, proteomic, and biochemical analyses have identified a minimal spliceosome in the red alga Cyanidioschyzon merolae. This spliceosome consists of only 40 core proteins, compared to ∼70 in S. cerevisiae (yeast) and ∼150...