Fig. 2. Analysis of data correlation categorized by fold change.

Correlation of microarray and qPCR data as it relates to (A) fold change measured by microarray and (B) fold change measured by qPCR. The combined data set of "all data" was queried first by microarray fold change (1.4 fold cut-off) and then by (C) spot intensity and (D) Ct values to determine the overall impact of fold change on array and qPCR data correlations. Asterisks indicate a statistically significant correlation (p<0.05). The hatched bars represent the compilation of the five individual data sets, referred to as "all data." Statistical differences of correlations, determined by ANOVA, are indicated by different letters. All correlations were calculated using Spearman’s Rho. The number of samples included in each correlation is shown in at the base of the bar. ND, no data (insufficient sample size, n≤2); DA, domoic acid; PbTx, brevetoxin; AZA, azaspiracid; TC, time course; DR, dose response.