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The 3-kb H. influenzae icc operon fragment cloned in pCMP. xseA, exonuclease VII, large subunit; ompP1, outer membrane protein; hyp., hypothetical protein; P1 and P2, putative promoter sites; open circle, putative CRP-binding site; inverted triangle, location of spc cassette insertion at bp 1573 (a BclI site) of pCMP::spc.
