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The EpsAB tyrosine kinase activity is required for biofilm formation. (A) Cartoon showing the disposition of EpsA in the membrane and the tyrosine (Y) cluster in EpsB. (B,C) Colonies of the wild type and the indicated mutants grown on biofilm-inducing medium. The strains were NCBI 3610 (WT), RL3852 (∆epsH), BAE250 (∆epsA), BAE251 (∆epsB), BAE252 (∆epsAB), BAE262 (∆epsAB amyE∷epsAB), RL3854 (∆sinR), and BAE388 (∆sinR∆epsB).
