Fig. 2
From: Transposable elements and gene expression during the evolution of amniotes
Tissue specific vs species-specific clustering of gene expression in amniotes. a, Clustering of samples based on expression values, calculated as transcripts per million (TPM) of one to one orthologous genes expressed in heart, brain, kidney, liver, testis and ovary (n=6596). UPGMA (Unweighted Pair Group Method with Arithmetic Mean) hierarchical clustering was used with distance between samples calculated using the average of all distances between pairs. b, Clustering of samples based on expression values, calculated as transcripts per million (TPM) of one to one orthologous genes expressed in heart, brain, kidney, liver, testis and ovary (n=6596). Ward’s minimum variance hierarchical clustering was used with distance between samples measured by the squared Euclidean distance. gal–Chicken; ano–anole lizard; bdg–bearded dragon (pogona); oan–platypus; mdo–opossum; hgs–human. br–brain; ht–heart; ts–testis; ov–ovary; kd–kidney; lv–liver