DHRS4 and blood disease: To analyse the genetic variation of PhcR and PhcQ among 34 RSSC strains (phylotype I, nine strains; phylotype IIA, six strains; phylotype IIB, five strains; phylotype III, three strains; and phylotype IV, 11 strains, including blood disease bacterial strain R229 and R. syzygii strain R24; Table S1), the deduced amino acid sequences of PhcR and PhcQ were analysed with ClustalW and phylogenetic trees were constructed with TreeView.