Illustration of some trimming details. The shaded area highlights the range covering the 30% from either end of the EST. According to the original SeqClean design, the vector contaminant is recognized only if some or all of the similar vector sequence is identified within this range. The boxes in blue indicate the vector-derived sequence. The yellow open boxes represent cDNA inserts and the green bars show the low quality regions. The small stars indicate where the number 1 base is located by CVS coordinates. The boxes in red specify the product of SeqClean trimming. Comments for each of the three listed trimming situations are denoted to their right. Condition A indicates those ESTs which were mistakenly trashed. Condition B shows incomplete trimming and condition C is an example of correct trimming. Example ESTs corresponding to each of the three conditions are shown in the table below, where the position numbering followed the coordinates of the untrimmed EST sequences.