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Nucleotide alignments of nematode rpl-3, rpl-7a, rpl-10a, and rpl-12 alternatively spliced introns. Conserved residues are boxed in gray, non-conserved residues in white. Normal and alternative splice sites (GT/AG), as determined by cDNA sequence analysis, are shown in bold and indicated by 5′ or 3′ arrows. Nucleotides encoding the first in-frame termination codons in unproductively spliced mRNAs are boxed in black. Species are C. elegans, C. briggsae, C. remanei, and P. penetrans.
