FIG. 1.

Genetic arrangement of the hmbR locus in N. gonorrhoeae strain FA1090 (accession number AF319529) and N. meningitidis strains NMB (accession numbers AF319530 and AF319531), 44/76 (accession number AF319527), and FAM18 (accession number AF319528). Each ORF is represented by an arrow that indicates the direction of transcription. The thin black vertical line indicates the position of a 23-bp sequence which is duplicated in hemO of strain NMB. The thick grey vertical lines indicate the positions of the 33-bp repeats of orfU. Black bars represent a 112-bp conserved nucleotide sequence immediately bordering the 3′ end of hmbR. White bars indicate the locations of neisserial repeat sequences (4). Hatched bars indicate the positions of the 1,280-bp sequence containing orfYX.