Fig. 1

Phylogenetic and structural analyses of He-elav. a ELAV phylogeny. Maximum likelihood tree topology is shown. Bootstrap support values (out of 500 replicates) are shown above branches and posterior probabilities are shown below branches. The branch leading to He-ELAV and its name are colored dark blue. The name of An-ELAV is colored red. b Genomic structure of He-elav. Relative to the sense strand, 5′ is to the left. Thick bars represent exons. Thin bars represent introns. Black = UTR. Blue = sequence that codes for the ELAV/HuD family splicing domain. Gray = all other coding sequences. The numbers represent nucleotide positions (see Additional file 1: Table S1). c Structure of He-ELAV protein. The N-terminus is to the left. Blue = ELAV/HuD family splicing domain. Gray = all other protein sequences. The numbers represent amino acid positions (see Additional file 1: Table S1). An, anonymous sequence (see main text); Cg, Crassostrea gigas; Dm, Drosophila melanogaster; Dma, Daphnia magna; He, Hypsibius exemplaris; Hs, Homo sapiens; Pd, Platynereis dumerilii; Sk, Saccoglossus kowalevskii