Files in this Data Supplement:

• Supplemental file 1 - Fig. S1, disruption of biofilm formation by an extracellular iron chelator; Fig. S2, biofilm formation and maintenance in response to iron availability; Fig. S3, roles of iron, Fur, and IscR in regulating biofilm formation; Fig. S4, iron homeostasis in the ΔiscR strain; Fig. S5, type I fimbriae are required for the ΔiscR biofilm phenotype; Table S1, oligonucleotides; Table S2, sensitivity of E. coli strains to streptonigrin.
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