Fig. 5

Multilevel gene-expression behaviour is highly spawn specific; examples of multilevel gene expression. a examples of genes with a two-level (upper plot), a three-level (middle plot) and a highly variable (lower plot) expression. b the same genes are ordered first as spawn then by developmental order. c the same Principal Component Analysis (PCA) plot of the expression levels of the expressed Ensembl genes as in Fig. 2, but with a colour scheme for four spawns as indicated, while the remaining five spawns are marked by in grey. Additional file 14 provides a PCA plot with all spawns marked with a different colour