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Multiple UHM–ULM interactions guide the early stages of spliceosome assembly and other pathways. Experimentally confirmed phosphorylation sites of the ULM-containing regions are marked by pink circles. “W” represents ULM tryptophans. Thick gray arrow represents the transition during spliceosome assembly. Thin black arrows represent known UHM–ULM interactions. Arrows toward SF3b155 indicate the general ULM-containing region rather than specific binding sites.
