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Sequence motifs of the 5′ (A) and 3′ (B) splice sites. Probability of the nucleotides at each position is displayed by using Weblogo version 3.7.1 (Crooks et al. 2004). The sequences of the introns are derived from 114,417 (5′) and 114,006 (3′) unique splice sites in 20-nt or longer introns annotated in WormBase (WS254). Position 0 indicates the beginning (A) and the end (B) of the introns.
