BLAST identification of brittle star genes. Automated BLAST was used to align Ophiocoma wendtii cDNA sequences to both the genome and transcriptome of the sea urchin Strongylocentrotus purpuratus, as well as to the KEGG Orthology database. The areas of the smaller circles represent the number of significant reciprocal best BLAST hits to the indicated datasets. Overlaps indicate matches of the same brittle star sequences to more than one dataset, and in nearly all such cases the matches from the different datasets are mutually consistent. For reference, the large dashed border represents the size of the S. purpuratus genome (~23,300 genes).