SyntTax interface. (A) Taxonomic tree allowing the selection of single or multiple genomes on the basis of their lineage. (B) The taxonomy database can be searched for single terms in order to retrieve the corresponding complete lineages. (C) A user-defined protein sequence can be introduced in any format including FASTA; numerals, blank spaces, and carriage returns are removed automatically. (D) Up to 100 individual genomes can be selected from the taxonomic tree and are listed for clarity. (E) The genomic BLAST search parameters can be user selected in order to allow all hits or to limit the search to the best hit for each genome. The degree of orthology can be user-selected between 10 and 100%.