Fig. 4

Co-expression of uniquely-mapping endo-siRNA and piRNA clusters. Each plot is divided in to groups of coloured scaffolds/chromosomes, each of which represents a developmental stage; four stages in Amphimedon, nine stages in Nematostella and 11 stages in Drosophila. For each plot, the earliest developmental stage is marked with an arrow indicating the chronological order of developmental stages. Links between scaffolds/chromosomes indicate co-expression from a particular endo-siRNA or piRNA cluster in the two linked developmental stages. For Drosophila, all chromosomes are represented while for Amphimedon and Nematostella, the ten largest genomic scaffolds were used. Beginning with the developmental stage indicated by the arrow, the stages for Amphimedon, Nematostella and Drosophila are as per Fig. 1. For each species, the links shared with a single developmental stage are coloured black for emphasis while the rest are coloured grey. For Amphimedon the emphasised stage is the pre-competent larvae (a1), for Nematostella the female adult (n9) and for Drosophila, the female adult head (d11)