Non-canonical splice sites identified in F. graminearum. A. Genes with non-canonical splice sites are shown. Capital letters represent exonic sequences, small letters represent intronic sequences. B. Analysis of nucleotides preference flanking GC donor splice site and AG acceptor splice site by using the MEME program . Y-axis indicates sequence conservation at each position. The height of symbols in each position represents the relative frequency of each nucleic acid. Arrows indicate splice sites.