Figure 3

TGA extraction. From each CDS with at least one FTB score ≥ 10 (CDS n represented by a black box), its FTB scores and those of its two adjacent CDSs (CDSs n-1 and n+1 represented by grey boxes) are compared to decide if it belongs to a TGA and to determine its position within the TGA. CDSs constitute a TGA if their profile of FTB scores corresponds to one of those shown in the Table. The symbol + indicates an FTB score ≥ 10 and the symbol - signifies an FTB score < 10. Letters as subscript of an FTB score refer to the target sequence flanking the analyzed CDS (downstream or upstream and the plus or minus strand). Three positions within a TGA are considered for a CDS: either the CDS begins the TGA or occupies a central position or ends the TGA. The four possible orientations of two CDSs in a TGA are described when the CDS analyzed occupies the last position of the TGA. A TGA containing at least one CDS and one gene relic (represented by a grey striped box) fulfils the conditions indicated in the last two lines of the table.