<p>Each dot represents a transcript. In case of differential expressed transcripts (n = 2,162) the dot is indicated in red. Transcripts within the same ellipse belong to the same cluster (100 clusters in total), according to K-means analysis. Axis indicates the first two principal components that explain the transcription expression variability. Several clusters have a significant enrichment for certain MapMan classes (according to PageMan), how showed in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0134909#pone.0134909.g005" target="_blank">Fig 5</a> and <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0134909#pone.0134909.t001" target="_blank">Table 1</a>.</p