Figure 1.

Sequence logos showing information content for the 36 noncanonical GA and GG 5′ intron donor splice sites and the 3′ acceptor sites for these introns, compared with sites for 261 introns with canonical donors in 10 conserved large ionotropic glutamate receptor family genes in the copepod E. affinis. (A) Ten bases of exon and 13 bases of intron sequence are shown for the donors. (B) Sixteen bases of intron and seven bases of exon sequence are shown for the acceptors. Sequence logos for frequencies of nucleotides are shown in Figure S1.