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Genetic organization of the Hie capsulation locus of strain 274. The arrows indicate genes. Region I contains four genes called bexDCBA, homologous to those found in Hib and Hif (white arrows). Region II includes eight serotype-specific genes designated ecs1 to ecs8 (right-hatched arrows). Region III comprises two genes named hcsA and hcsB, homologous to those found in Hib and Hif (gray arrows).
