F8 and cystic fibrosis: Given that HemP homologs have been reported in Y. enterocolitica, E. meliloti, B. japonicum, and B. multivorans and that P. aeruginosa and S. maltophilia are often coisolated from cystic fibrosis patients, the hemin acquisition systems in the five microorganisms were compared to the hemP-hemA-smlt0796-smlt0797 operon of S. maltophilia.