Fig. 7From: Integrated transcriptomics and metabolomics analysis to characterize cold stress responses in Nicotiana tabacum A parallel principal component analysis (PCA) of gene and metabolite profiles under cold treatment. Each point represents one experiments for gene expression and metabolite profiling. a PCA model for gene expression experiments. b PCA model for primary metabolite profiling. c PCA model for secondary metabolite profilingBack to article page