A Parallel Spliceosome

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Science  27 Sep 1996:
Vol. 273, Issue 5283, pp. 1813
DOI: 10.1126/science.273.5283.1813


In this issue of Science, Tarn and Steitz (p. 1824) report the identification of two new RNAs that reside in the special spliceosome that acts on the rare AT-AC class of introns. In his Perspective, Nilsen describes why the now complete description of the RNA components of this spliceosome has larger implications for splicing mechanisms in general.