Fig. 2

The globin genes of Platynereis dumerilii. a Schematic representation of aligned primary structures of globin genes identified in Platynereis transcriptomes and genome. Five invariant amino acid positions provide solid anchor sites for precise homology alignments. Small Alignment gaps are not represented. The predominantly conserved introns positions B12.2 and G7.0 are marked by green stapled lines. Additional introns positions are shown with green arrowheads. Predicted N-terminal signal peptides and acylations are represented as shown. b Schematic representation of the two globin gene clusters found on Platynereis scaffolds. Orange and red block arrows indicate the length and strand position of the genes. Each gene is interrupted by 3–4 introns. Gene Egb-B1 partially overlaps with gene Egb-B2, by a small exon located inside one of the other gene introns