H. ducreyi contains a 12.8 kb flp (fimbria like protein) operon with 15 genes (flp1-flp2-flp3-orfBC-rcpAB-orfD-tadABCDEFG) that encode products with homology to proteins encoded by the tad locus in Aggregatibacter actinomycetemcomitans. ...
Flp2/Tad2 pili (Fimbrial low-molecular-weight protein pili/tight adherence pili)