Organ expression of co-expressed triterpene synthases (TTPS) and P450s. Microarray expression data were retrieved from the 'Genevestigator' database and processed as described in Methods. Expression vectors from the organ and tissue data sets of five TTPS genes (from A. thalaina was used as a bait for co-expression analysis comparing it's expression with that of all P450 genes. We retained five TTPS genes, which were co-expressed (r > 0.75) with at least one P450 in the organ and tissue expression data set, and the corresponding P450s (Table 2). This set of genes was used visualize expression. TTPS (in bold) and correlated P450 genes with high correlation coefficients are color coded.