| Identifier | Protein names | Gene names | Cross reference refseq | Length | Species |
| P45563 | Purine nucleoside phosphorylase 2; EC 2.4.2.1; Inosine-guanosine phosphorylase; Purine nucleoside phosphorylase II; PNP II; Xanthosine phosphorylase; | xapA; pndA; b2407 JW2398; | NP_416902.1;YP_490642.1; | 277 | escherichia-coli |
| P23841 | HTH-type transcriptional regulator XapR; Xanthosine operon regulatory protein; | xapR; pndR yfeB; b2405 JW2396; | NP_416900.1;YP_490640.1; | 294 | escherichia-coli |
| P45562 | Xanthosine permease; Xanthosine transporter; | xapB; b2406 JW2397; | NP_416901.1;YP_490641.1; | 418 | escherichia-coli |
| Q46799 | Xanthine dehydrogenase molybdenum-binding subunit; EC 1.17.1.4; | xdhA; ygeS; b2866 JW5462; | NP_417342.1;YP_491068.1; | 752 | escherichia-coli |
| Q46800 | Xanthine dehydrogenase FAD-binding subunit; EC 1.17.1.4; | xdhB; ygeT; b2867 JW2835; | NP_417343.1;YP_491069.1; | 292 | escherichia-coli |
| Q46801 | Xanthine dehydrogenase iron-sulfur-binding subunit; | xdhC; ygeU; b2868 JW2836; | NP_417344.1;YP_491070.1; | 159 | escherichia-coli |
| Q46814 | Probable hypoxanthine oxidase XdhD; EC 1.-.-.-; | xdhD; ygfN; b2881 JW2849; | NP_417357.1;YP_491083.1; | 956 | escherichia-coli |
| P0A8P6 | Tyrosine recombinase XerC; | xerC; b3811 JW3784; | NP_418256.1;YP_491630.1; | 298 | escherichia-coli |
| P0A8P8 | Tyrosine recombinase XerD; | xerD; xprB; b2894 JW2862; | NP_417370.1;YP_491095.1; | 298 | escherichia-coli |
| P0A9M5 | Xanthine phosphoribosyltransferase; EC 2.4.2.22; Xanthine-guanine phosphoribosyltransferase; XGPRT; | gpt; gpp gxu; b0238 JW0228; | NP_414773.1;YP_488533.1; | 152 | escherichia-coli |
| P38506 | Flap endonuclease Xni; FEN; EC 3.1.-.-; Exonuclease IX; ExoIX; | ygdG; exo xni; b2798 JW5446; | NP_417278.4;YP_491006.1; | 251 | escherichia-coli |
| P00944 | Xylose isomerase; EC 5.3.1.5; D-xylulose keto-isomerase; | xylA; b3565 JW3537; | NP_418022.1;YP_491869.1; | 440 | escherichia-coli |
| P09099 | Xylulose kinase; Xylulokinase; EC 2.7.1.17; | xylB; b3564 JW3536; | NP_418021.1;YP_491870.1; | 484 | escherichia-coli |
| P37387 | D-xylose-binding periplasmic protein; | xylF; xylT; b3566 JW3538; | NP_418023.1;YP_491868.1; | 330 | escherichia-coli |
| P0AGF4 | D-xylose-proton symporter; D-xylose transporter; | xylE; b4031 JW3991; | NP_418455.1;YP_492174.1; | 491 | escherichia-coli |
| P37388 | Xylose import ATP-binding protein XylG; EC 3.6.3.17; | xylG; b3567 JW3539; | NP_418024.1;YP_491867.1; | 513 | escherichia-coli |
| P0AGI4 | Xylose transport system permease protein XylH; | xylH; b3568 JW3540; | NP_418025.1;YP_491866.1; | 393 | escherichia-coli |
| P31434 | Alpha-xylosidase; EC 3.2.1.177; | yicI; b3656 JW3631; | NP_418113.1;YP_491778.1; | 772 | escherichia-coli |
| P0ACI3 | Xylose operon regulatory protein; | xylR; b3569 JW3541; | NP_418026.1;YP_491865.1; | 392 | escherichia-coli |
| P75971 | Putative uncharacterized protein b1142; | b1142 JW1128; | YP_489410.1; | 103 | escherichia-coli |
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