further characterization of the vir-fha clones by tn5 mutagenesis in e. coli and by the return of cloned sequences to b. pertussis in trans and to the b. pertussis chromosome led to the localization of the vir locus , the structural gene for fha , and genes that are possibly required for the synthesis and export of fha .
C0008633
chromosome
C1708726
locus