Fig. 3From: Identification and evolutionary analysis of long non-coding RNAs in zebra finchClustering analysis of the expressed genes and the expression heat map. Hierarchical clustering analysis clustered the 13,362 expressed annotated genes and 2,949 unannotated transcripts into 12 clusters (A-L, see Additional files tables for details). The expression levels of each gene are shown as the scaled FPKM values across the six transcriptomes (scaled z-score: red = up-regulation, blue = down-regulation). Three clades (F, G, and L) used for further analysis were labeled in yellowBack to article page