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Expression levels of cylA in 12 clinical E. faecalis isolates. The expression levels of cylA were determined by qRT-PCR, with the clinical E. faecalis isolate 16C76 as the reference strain (expression=1, biofilm negative). Biofilm phenotype: −, negative; +, weak; ++, strong. In the weak biofilm isolates, cylA was overexpressed (8.75- to 23.05-fold).
