Intron positions are rarely lost at the 5' end
Examples in which the intron position at the 5' end (i1) of the protein-coding gene sequence is not conserved exist, but they remain exceptional .
CLUSTALX multiple alignment of S. cerevisiae paralogous genes
CLUSTALX multiple alignment of orthologous genes
Last modified: Tue Feb 10 11:11:50 CET 2004