| Identifier | Protein names | Gene names | Cross reference refseq | Length | Species |
| P75825 | Hydroxylamine reductase; EC 1.7.99.1; Hybrid-cluster protein; HCP; Prismane protein; | hcp; ybjW; b0873 JW0857; | NP_415394.4;YP_489146.1; | 550 | escherichia-coli |
| P75824 | NADH oxidoreductase HCR; EC 1.-.-.-; | hcr; ybjV; b0872 JW5117; | NP_415393.1;YP_489145.1; | 322 | escherichia-coli |
| P69931 | DnaA regulatory inactivator Hda; DnaA paralog; Dp; | hda; idaB yfgE; b2496 JW5397; | NP_416991.2;YP_490724.1; | 233 | escherichia-coli |
| P0AET2 | Acid stress chaperone HdeB; 10K-L protein; | hdeB; yhhD yhiC; b3509 JW5669; | NP_417966.4;YP_491926.1; | 108 | escherichia-coli |
| P0AES9 | Acid stress chaperone HdeA; 10K-S protein; | hdeA; yhhC yhiB; b3510 JW3478; | NP_417967.1;YP_491925.1; | 110 | escherichia-coli |
| P0A8R9 | HTH-type transcriptional regulator HdfR; H-NS-dependent flhDC regulator; | hdfR; pssR yifA yifD; b4480 JW5607; | YP_026246.1;YP_491673.1; | 279 | escherichia-coli |
| P0AET5 | Protein HdeD; | hdeD; yhiA; b3511 JW3479; | NP_417968.1;YP_491924.1; | 190 | escherichia-coli |
| P0AET8 | 7-alpha-hydroxysteroid dehydrogenase; 7-alpha-HSDH; EC 1.1.1.159; | hdhA; hsdH; b1619 JW1611; | NP_416136.1;YP_489882.1; | 255 | escherichia-coli |
| P15038 | Helicase IV; EC 3.6.4.12; 75 kDa helicase; | helD; b0962 JW0945; | NP_415482.1;YP_489234.1; | 684 | escherichia-coli |
| P0A6X1 | Glutamyl-tRNA reductase; GluTR; EC 1.2.1.70; | hemA; b1210 JW1201; | NP_415728.1;YP_489477.1; | 418 | escherichia-coli |
| P0ACB2 | Delta-aminolevulinic acid dehydratase; ALAD; ALADH; EC 4.2.1.24; Porphobilinogen synthase; | hemB; ncf; b0369 JW0361; | NP_414903.4;YP_488662.1; | 324 | escherichia-coli |
| P06983 | Porphobilinogen deaminase; PBG; EC 2.5.1.61; Hydroxymethylbilane synthase; HMBS; Pre-uroporphyrinogen synthase; | hemC; popE; b3805 JW5932; | YP_026260.1;YP_491637.1; | 313 | escherichia-coli |
| P09126 | Uroporphyrinogen-III synthase; UROS; EC 4.2.1.75; Hydroxymethylbilane hydrolyase [cyclizing]; Uroporphyrinogen-III cosynthase; | hemD; b3804 JW3776; | NP_418248.1;YP_491638.1; | 246 | escherichia-coli |
| P36553 | Oxygen-dependent coproporphyrinogen-III oxidase; CPO; Coprogen oxidase; Coproporphyrinogenase; EC 1.3.3.3; | hemF; b2436 JW2429; | NP_416931.1;YP_490672.1; | 299 | escherichia-coli |
| P0ACB4 | Protoporphyrinogen IX dehydrogenase [menaquinone]; EC 1.3.5.3; | hemG; yihB; b3850 JW3827; | NP_418292.1;YP_491594.1; | 181 | escherichia-coli |
| P23871 | Ferrochelatase; EC 4.99.1.1; Heme synthase; Protoheme ferro-lyase; | hemH; popA visA; b0475 JW0464; | NP_415008.1;YP_488766.1; | 320 | escherichia-coli |
| P32131 | Oxygen-independent coproporphyrinogen-III oxidase; CPO; EC 1.3.99.22; Coproporphyrinogen III dehydrogenase; CPDH; | hemN; yihJ; b3867 JW3838; | NP_418303.2;YP_491583.1; | 457 | escherichia-coli |
| P09127 | Putative uroporphyrinogen-III C-methyltransferase; Urogen-III methylase; EC 2.1.1.107; ORF X; | hemX; b3803 JW3775; | NP_418247.1;YP_491639.1; | 393 | escherichia-coli |
| P0ACB7 | Protein HemY; | hemY; b3802 JW3774; | NP_418246.1;YP_491640.1; | 398 | escherichia-coli |
| P46118 | HTH-type transcriptional regulator HexR; Hex regulon repressor; | hexR; yebK; b1853 JW1842; | NP_416367.1;YP_490115.1; | 289 | escherichia-coli |
