Primary Probe Sets. Signal intensity and heat shock/pre-heat shock ratios for primary probe replicates. Heat shock/pre-heat shock ratios between 0.7 and 1.5 exhibit no significant change in gene expression. Genes with ratios above 1.5 are up-regulated and genes below 0.7 are down-regulated. (A) The primary probe replicates for BCAL0007 identified no outliers, signal intensity and ratios are consistent for all replicates. (B) In the set for BCAL0396 probe 9 was identified as an outlier. The heat shock and pre-heat shock signal intensities for this probe are lower than the majority, however the ratio is the same.