These alignment data are provided as supplement to the publication Vertebrate-type intron-rich genes in the marine annelid Platynereis dumerilii appearing in Science, November 25th, 2005 Folder fig2 contains the alignments used for the intron analysis (fig 2) All accession numbers are indicated in the online supplementary material Folder fig3 contains - the concatenated alignment (PAADHCC-all-aln.phy) analysed for the protein similarity analysis (fig 3) - the single alignments before applying Gblocks - a table with the identifiers of the proteins in each alignment Due to the fact that Platynereis EST sequences were clustered prior to the analysis, the Platynereis DNA sequences are provided separately in the file http://www.bork.embl.de/Docu/raible/sequences/fig3_Pdu_seqs.fasta Species names are abbreviated as follows: Ag Anopheles gambiae Am Apis mellifera Ce Caenorhabditis elegans Ci Ciona intestinalis Dm Drosophila melanogaster Fr Fugu rubripes Hs Homo sapiens Mm Mus musculus Pdu Platynereis dumerilii For questions or comments, please contact Florian Raible raible@embl.de