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Structural models of the (A) free bI3 RNA and (B) the RNA in the six-component RNP complex. RNA structural elements whose base pairing changes between the two models are emphasized in color. Red and blue arrows indicate long-range tertiary interactions that form in the holocomplex. Interactions promoted by the Mrs1 and maturase proteins are colored red and blue, respectively. The scissile phosphate, cleaved in the first step of splicing, is shown as a magenta sphere.
