FIG. 2.

Biofilm formation by parental and mutant E. faecalis strains. The OD₅₅₀s of solubilized crystal violet from microtiter plate assays at 24 h (stippled) and 48 h (solid) are shown for the strains listed. (A) All strains are derivatives of the E. faecalis V583 clinical isolate. Indicated is the name of the strain, its relevant genotype, the name of the plasmid it carries, and the complementing gene present on the plasmid (in parentheses). Strains JML102 and JML103 were omitted, as the level of biofilm formation was comparable to the level observed with strain JML101. (B) All strains are derivatives of the E. faecalis FA2-2 laboratory strain and thus carry the fsrC mutation. Complementing plasmids are indicated as described above.