<p>The shown scenario is based on <i>Trichoplax adhaerens</i> EST data (Burger <i>et al</i>., 2009). The figure only shows <i>cox1</i> exons 6 and 7 and the intron between them (following NC_008151). After splicing of exons the “U” at the 3’ end of exon 6 is converted to a “C” by mRNA editing. Exons and introns are illustrated in yellow and blue, respectively. mRNA editing (“U-to-C”) is illustrated by red lightning. For further explanations see text and Burger <i>et al</i>., 2009.</p
