Assembled sequences of the Olavius symbionts’ metagenome were obtained from NCBI with the project accession number AASZ00000000 . The database contained 5597 genomic sequences, which corresponded to a total of 23.7 million nucleotides. Non-redundant (NR) protein database was downloaded from NCBI ftp server. This dataset contained a total of 4 644 764 protein sequences (1 603 127 260 amino acids). BLAST was also obtained from NCBI.