Table 1.

Classification of Helicobacter pylori outer membrane proteins.

Protein Family	Number of Sub-Family	Sub-Family Genes
Hop	22	hopZ, hopD, hopM, hopA, hopF, hopG, hopJ, hopH, hopE, hopO, hopP, hopC, hopB, hopK, hopI, hopL, hopQ, hopN, hopU babA, babB
Hor	12	horA, horB, horC, horD, horE, horF, horG, horH, horI, horJ, horK, horL
Hof	8	hofA, hofB, hofC, hofD, hofE, hofF, hofG, hofH
Hom	4	homA, homB, homC, homD
FecA-like	3	fecA-1, fecA-2, fecA-3
FrpB-like	3	frpB-1, frpB-2, frpB-3
Efflux pump	6	hefA, hefD, hefG flgH palA lpp20