Figure 5

Probe expression distributions and relative uniqueness of varying x-mer sizes. A. Probe expression distribution for different tissues of Arabidopsis and various other species, as indicated. Data shown are the smoothed histograms of the log2 (perfect match expression) values for each sample taken from microarray datasets (see text). Datasets are adjusted to the same fifth percentile. B. Relative uniqueness of varying x-mer sizes in full cDNA collections from several sequenced genomes. For each species, specified by a different colored line, we determined all DNA x-mers of various sizes (x = 15, 20, 25, 30, 35, or 40 bp). Relative x-mer uniqueness is number of x-mers unique to only one gene divided by the total number of x-mers in the transcriptome. The level of uniqueness increases with size of x-mer, and varies with the organism.