| Identifier | Protein names | Gene names | Cross reference refseq | Length | Species |
| P0ABC3 | Modulator of FtsH protease HflC; | hflC; hflA; b4175 JW4133; | NP_418596.1;YP_492317.1; | 334 | escherichia-coli |
| P25746 | High frequency lysogenization protein HflD; | hflD; ycfC; b1132 JW5165; | NP_415650.1;YP_489400.1; | 213 | escherichia-coli |
| P0ABC7 | Modulator of FtsH protease HflK; | hflK; hflA; b4174 JW4132; | NP_418595.1;YP_492316.1; | 419 | escherichia-coli |
| P25519 | GTPase HflX; GTP-binding protein HflX; | hflX; b4173 JW4131; | NP_418594.1;YP_492315.1; | 426 | escherichia-coli |
| P0A6X3 | RNA-binding protein Hfq; HF-1; Host factor-I protein; HF-I; | hfq; b4172 JW4130; | NP_418593.1;YP_492314.1; | 102 | escherichia-coli |
| P0ACE3 | Hemolysin expression-modulating protein Hha; | hha; b0460 JW0449; | NP_414993.1;YP_488751.1; | 72 | escherichia-coli |
| P76106 | Probable mRNA interferase HicA; EC 3.1.-.-; Endoribonuclease HicA; Toxin HicA; | hicA; yncN; b4532 JW5230; | NP_415954.2;YP_489702.1; | 58 | escherichia-coli |
| P67697 | Antitoxin HicB; | hicB; ydcQ; b1438 JW1433; | NP_415955.2;YP_489703.1; | 138 | escherichia-coli |
| P64578 | mRNA interferase HigB; EC 3.1.-.-; Endoribonuclease HigB; Toxin HigB; | higB; ygjN; b3083 JW3054; | NP_417554.1;YP_491274.1; | 104 | escherichia-coli |
| P67701 | Antitoxin HigA; | higA; ygjM; b3082 JW3053; | NP_417553.1;YP_491273.1; | 138 | escherichia-coli |
| P0ACE7 | HIT-like protein HinT; EC 3.-.-.-; Purine nucleoside phosphoramidase; | hinT; ycfF; b1103 JW1089; | NP_415621.3;YP_489371.1; | 119 | escherichia-coli |
| P23874 | Serine/threonine-protein kinase HipA; Ser/Thr-protein kinase HipA; EC 2.7.11.1; Toxin HipA; | hipA; b1507 JW1500; | NP_416024.1;YP_489771.1; | 440 | escherichia-coli |
| P23873 | Antitoxin HipB; | hipB; b1508 JW1501; | NP_416025.1;YP_489772.1; | 88 | escherichia-coli |
| P60757 | ATP phosphoribosyltransferase; ATP-PRT; ATP-PRTase; EC 2.4.2.17; | hisG; b2019 JW2001; | NP_416523.1;YP_490262.1; | 299 | escherichia-coli |
| P06989 | Histidine biosynthesis bifunctional protein HisIE; EC 3.6.1.31; EC 3.5.4.19; PRA-PH; PRA-CH; | hisI; hisIE; b2026 JW2008; | NP_416530.1;YP_490269.1; | 203 | escherichia-coli |
| P10371 | 1-(5-phosphoribosyl)-5-[(5-phosphoribosylamino)methylideneamino] imidazole-4-carboxamide isomerase; EC 5.3.1.16; Phosphoribosylformimino-5-aminoimidazole carboxamide ribotide isomerase; | hisA; b2024 JW2006; | NP_416528.2;YP_490267.1; | 245 | escherichia-coli |
| P60595 | Imidazole glycerol phosphate synthase subunit HisH; EC 2.4.2.-; IGP synthase glutamine amidotransferase subunit; IGP synthase subunit HisH; ImGP synthase subunit HisH; IGPS subunit HisH; | hisH; b2023 JW2005; | NP_416527.1;YP_490266.1; | 196 | escherichia-coli |
| P60664 | Imidazole glycerol phosphate synthase subunit HisF; EC 4.1.3.-; IGP synthase cyclase subunit; IGP synthase subunit HisF; ImGP synthase subunit HisF; IGPS subunit HisF; | hisF; b2025 JW2007; | NP_416529.1;YP_490268.1; | 258 | escherichia-coli |
| P06987 | Histidine biosynthesis bifunctional protein HisB; EC 4.2.1.19; EC 3.1.3.15; IGPD; | hisB; b2022 JW2004; | NP_416526.4;YP_490265.1; | 355 | escherichia-coli |
| P06986 | Histidinol-phosphate aminotransferase; EC 2.6.1.9; Imidazole acetol-phosphate transaminase; HPAT; HspAT; | hisC; b2021 JW2003; | NP_416525.1;YP_490264.1; | 356 | escherichia-coli |
