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(A) The most commonly exhibited HEp-2 adherence patterns of 042, its isogenic hra1 mutant, SB1, and the transcomplement SB1(pBJ1) at 3 hours. (B) The number of HEp-2 cells around which bacteria demonstrated the strict stacked brick pattern, a disheveled arrangement, or a mixed pattern that could not be objectively categorized as one or the other. For each strain, adherence patterns around 25 HEp-2 cells were counted.
