Figure 2

Nucleotide sequence conservation. A) Top, line plot displaying the level of conservation at each position of the alignment of the 95 species analyzed (dark gray boxes, location of 3'ss, XX and Y splicing enhancer motifs; light gray box, GAG binding site). Bottom, schematic representation of the genomic region aligned. B) Sequence logo of the 3'ss. Positions are numbered according to the exon sequence. C) Sequence logo of the XX and Y splicing enhancer motifs. Positions are numbered according to the exon sequence.