Fig. 2From: Comparison of RNA isolation methods on RNA-Seq: implications for differential expression and meta-analysesPrincipal component analysis (PCA) strongly implicates RNA isolation method as a batch effect. PCA on TPMs for each sample (see Methods) shows clear separation on both treatment (PC1) and RNA isolation method (PC2). Kit samples were more similar to each other than they were to the Phenol samplesBack to article page