Examples of sequencing results for cDNA clones having concatamers of TS oligo. Sequence example A reflects a cDNA clone with an insert that appears to be comprised entirely of a concatamer of 20 direct repeats of TS oligo (highlighted in alternate shades of gray) associated with a single oligo-dT reverse primer (highlighted in turquoise). The 11 intervening bases are of unknown origin. See Figure 1A for a diagrammatic representation of the process whereby this type of concatamer may arise. Sequence example B shows 9 repeats of TS oligo concatamerized to a 178 base sequence with homology to nucleotide sequences from Vitus vinifera and Arabidopsis thaliana potentially representing a plant metalloendopeptidase. The oligo-dT reverse primer is also shown. See Figure 1B for a representation of the mechanism by which this type of concatameric sequence would be generated.