The omamAms mutant shares a morphology phenotype with mce operon mutants. Two μL spots of culture were plated on Mueller Hinton plates containing glucose and Congo red. The resulting colonies were visualized after 2 days at 2X and 5.6X magnification (Leica M420 macroscope). Results are representative of at least three independent experiments comparing WT +pMV261 (EP1182), Δmce4 +pMV261 (EP1204), Δmce6X +pMV261 (EP1208), ΔomamA +pMV261 (EP1193), ΔomamA +omamAms (EP1194), ΔomamA +omamAmtb (EP1203), ΔomamAΔmce4 +pMV261 (EP1206), and ΔomamAΔmce6X +pMV261 (EP1210). pMV261 is an empty vector, omamA expression constructs are cloned in pMV261.