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Two orthogonal views of the B complex structure. Subunits are coloured according to snRNP identity (U2, green; U4, yellow; U5, blue; U6, red; Dib1, Prp6 and Snu66, shades of yellow). B complex proteins in shades of magenta (Spp381, magenta; Prp38, light magenta; Snu23, violet).
