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Alternative splicing choices are governed by splicing regulatory protein interactions with splicing silencer and enhancer elements present in the pre-mRNA. However, the prediction of these choices from genomic sequence is difficult, in part because the regulators can act as either enhancers or silencers. A recent study describes how for a particular neuronal splicing regulatory protein, Nova, the location of its binding sites is highly predictive of the protein''s effect on an exon''s splicing. [Copyright &y& Elsevier]