Example of alternative splicing of micro-exon in A. thaliana. (A) Fragment of Sim4 alignment of AF410302.1 sequence (top) with genomic DNA (bottom). Sim4 incorrectly aligns the TG-dinucleotide micro-exon against gaps to yield a GT donor splice site. (B) Fragment of alignment after the correction procedure in which the TG-dinucleotide micro-exon is positioned adjacent to the consensus splice sites. (C) Fragment of alignment between AF410302.1 (top) and Ceres_ 17241 (bottom) cDNA sequences. The micro-exon is colored green, whereas the dinucleotide consensus splice sites are colored red.