Supplemental material

Files in this Data Supplement:

• Supplemental file 1 - Legends to Fig. S1 and S2
  MS Word document, 25K.
• Supplemental file 2 - Fig. S1, genomic organization of flagellar genes in 41 bacterial species
  Zipped PDF document, 986K.
• Supplemental file 3 - Fig. S2, phylogenetic tree of secondary flagellar systems
  Zipped PDF document, 211K.