In Experiment 1, BLASTP was used to execute queries on a 36 MB database composed of 88,355 sequences from 11 bacterial genomes, in order to identify genes shared by different species. Ten bacteria described in literature as being resistant to ionizing radiation  and one species susceptible to radiation were obtained from Refseq database. The same dataset is provided as query and target database, so that an all-to-all bacteria comparison is executed, producing a 610 MB output. BLASTP results were processed to identify RBH among pairs of species.