Quality of human ORF features on GMAP chip. (a) Intensity signals from the GMAP array (X-axis) plotted against signals from the Human Gene 1.0 ST array (Y-axis) following amplification of human ORFeome v5.1 pools and hybridization of the resulting probe to each of these arrays. Common features between the two arrays were used to calculate the Pearson correlation coefficient. (b) Distribution of signal intensities from replicate GMAP or Human 1.0 ST arrays as described in (a) for shared features. Hybridization behaviour for the huORF features compared to the (c) huGene features or the (d) 22-mer hairpin features for corresponding genes.