Proteome comparison represented by a BLAST matrix, based on 24 Negativicutes genomes with reciprocal best hits. The genomes of Clostridium botulinum, Cl. cellulolyticum, Desulfotomaculum reducens and E. coli are added for comparison. Inter-genus comparisons are indicated by black squares. A version reporting the numerical values of homology percentages is available as supplementary information.