* 1.B.1 General bacterial porin family
* 1.B.2 Chlamydial porin (CP) family
* 1.B.3 Sugar porin (SP) family
* 1.B.4 Brucella-Rhizobium porin (BRP) family
* 1.B.5 Pseudomonas OprP porin (POP) family
* 1.B.6 OmpA-OmpF porin (OOP) family
* 1.B.7 Rhodobacter PorCa porin (RPP) family
* 1.B.8 Mitochondrial and plastid porin (MPP) family
* 1.B.9 FadL outer membrane protein (FadL) family
* 1.B.10 Nucleoside-specific channel-forming outer membrane porin (Tsx) family
* 1.B.11 Outer membrane fimbrial usher porin (FUP) family
* 1.B.12 Autotransporter-1 (AT-1) family
* 1.B.13 Alginate export porin (AEP) family
* 1.B.14 Outer membrane receptor (OMR) family
* 1.B.15 Raffinose porin (RafY) family
* 1.B.16 Short chain amide and urea porin (SAP) family
* 1.B.17 Outer membrane factor (OMF) family
* 1.B.18 Outer membrane auxiliary (OMA) protein family
* 1.B.19 Glucose-selective OprB porin (OprB) family
* 1.B.20 Two-partner secretion (TPS) family
* 1.B.21 OmpG porin (OmpG) family
* 1.B.22 Outer bacterial membrane secretin (secretin) family
* 1.B.23 Cyanobacterial porin (CBP) family
* 1.B.24 Mycobacterial porin
* 1.B.25 Outer membrane porin (Opr) family
* 1.B.26 Cyclodextrin porin (CDP) family
* 1.B.31 Campylobacter jejuni major outer membrane porin (MomP) family
* 1.B.32 Fusobacterial outer membrane porin (FomP) family
* 1.B.33 Outer membrane protein insertion porin (Bam complex) (OmpIP) family
* 1.B.34 Corynebacterial porins
* 1.B.35 Oligogalacturonate-specific porin (KdgM) family
* 1.B.39 Bacterial porin, OmpW (OmpW) family
* 1.B.42 Outer membrane lipopolysaccharide export porin (LPS-EP) family
* 1.B.43 Coxiella porin P1 (CPP1) family
* 1.B.44 Probable protein translocating porphyromonas gingivalis porin (PorT) family
* 1.B.49 Anaplasma P44 (A-P44) porin family
* 1.B.48 Curli-like transporters
* 1.B.54 Intimin/Invasin (Int/Inv) or Autotransporter-3 family
* 1.B.55 Poly-acetyl-D-glucosamine porin (PgaA) family
* 1.B.57 Legionella major-outer membrane protein (LM-OMP) family
* 1.B.60 Omp50 porin (Omp50 Porin) family
* 1.B.61 Delta-proteobacterial porin (Delta-porin) family
* 1.B.62 Putative bacterial porin (PBP) family
* 1.B.66 Putative beta-barrel porin-2 (BBP2) family
* 1.B.67 Putative beta barrel porin-4 (BBP4) family
* 1.B.68 Putative beta barrel porin-5 (BBP5) superfamily
* 1.B.70 Outer membrane channel (OMC) family
* 1.B.71 Proteobacterial/verrucomicrobial porin (PVP) family
* 1.B.72 Protochlamydial outer membrane porin (PomS/T) family
* 1.B.73 Capsule biogenesis/assembly (CBA) family
* 1.B.78 DUF3374 electron transport-associated porin (ETPorin) family