1. 2.3.1.33 enzyme   acetylhistidine synthetase
                      histidine acetyltransferase
                      histidine N-acetyltransferase
                      acetyl-CoA:L-histidine N-acetyltransferase

2. 2.6.1.38 enzyme   histidine aminotransferase
                      histidine transaminase
                      histidine-2-oxoglutarate aminotransferase
                      L-histidine:2-oxoglutarate aminotransferase

3. 2.7.3.11 enzyme   histidine kinase
                      histidine protein kinase
                      protein kinase (histidine)
                      protein-histidine pros-kinase
                      ATP:protein-L-histidine N(pi)-phosphotransferase
                      ATP:protein-L-histidine N-pros-phosphotransferase

4. 2.7.3.12 enzyme   histidine kinase
                      histidine protein kinase
                      protein histidine kinase
                      protein kinase (histidine)
                      protein-histidine tele-kinase
                      ATP:protein-L-histidine N(tau)-phosphotransferase
                      ATP:protein-L-histidine N-tele-phosphotransferase

5. 3.6.3.21 enzyme   histidine permease
                      polar-amino-acid-transporting ATPase
                      ATP phosphohydrolase (polar-amino-acid-importing)

6. 4.1.1.22 enzyme   histidine decarboxylase
                      L-histidine decarboxylase
                      L-histidine carboxy-lyase

7. 6.1.1.21 enzyme   histidine translase
                      histidine-tRNA ligase
                      L-histidine:tRNA(His) ligase (AMP-forming)
                      histidyl-tRNA synthetase
                      histidyl-transfer ribonucleate synthetase

8. 2.1.1.44 enzyme   dimethylhistidine methyltransferase
                      dimethylhistidine N-methyltransferase
                      histidine-alpha-N-methyltransferase
                      S-adenosyl-L-methionine:N(alpha),N(alpha)-dimethyl-L-histidine N(alpha)-methyltransferase

9. 2.1.1.85 enzyme   protein (histidine) methyltransferase
                      actin-specific histidine methyltransferase
                      protein-histidine N-methyltransferase
                      S-adenosyl methionine:protein-histidine N-methyltransferase
                      S-adenosyl-L-methionine:protein-L-histidine N-tele-methyltransferase
                      protein methylase IV

10. 2.6.1.58 enzyme   histidine:pyruvate aminotransferase
                      phenylalanine (histidine) aminotransferase
                      phenylalanine(histidine) transaminase
                      phenylalanine(histidine):pyruvate aminotransferase
                      L-phenylalanine(L-histidine):pyruvate aminotransferase
                      L-phenylalanine:pyruvate aminotransferase

11. 2.7.13.1 enzyme   histidine kinase (ambiguous)
                      histidine protein kinase (ambiguous)
                      protein histidine kinase (ambiguous)
                      protein kinase (histidine) (ambiguous)
                      protein-histidine pros-kinase
                      ATP:protein-L-histidine N-pros-phosphotransferase
                      HK2

12. 2.7.13.2 enzyme   histidine kinase (ambiguous)
                      histidine protein kinase (ambiguous)
                      protein histidine kinase (ambiguous)
                      protein kinase (histidine) (ambiguous)
                      protein-histidine tele-kinase
                      ATP:protein-L-histidine N-tele-phosphotransferase
                      HK3

13. 4.3.1.3 enzyme   histidine alpha-deaminase
                      histidine ammonia-lyase
                      L-histidine ammonia-lyase
                      histidase
                      histidinase

14. 2.6.1.9 enzyme   histidine:imidazoleacetol phosphate transaminase
                      IAP transaminase
                      imidazolylacetolphosphate aminotransferase
                      imidazolylacetolphosphate transaminase
                      histidinol phosphate aminotransferase
                      histidinol-phosphate transaminase
                      imidazoleacetol phosphate transaminase
                      L-histidinol phosphate aminotransferase
                      glutamic-imidazoleacetol phosphate transaminase
                      L-histidinol-phosphate:2-oxoglutarate aminotransferase

15. 3.4.13.5 enzyme   acetylhistidine deacetylase
                      N-acetylhistidine deacetylase
                      aminoacyl-methylhistidine dipeptidase
                      alpha-N-acetyl-L-histidine aminohydrolase
                      anserinase
                      X-methyl-His dipeptidase
                      Xaa-methyl-His dipeptidase

16. 2.7.3.9 enzyme   phosphoenolpyruvate:protein-L-histidine N(pi)-phosphotransferase
                      phosphoenolpyruvate:protein-L-histidine N-pros-phosphotransferase
                      phosphoenolpyruvate-protein phosphotransferase
                      phosphopyruvate-protein phosphotransferase
                      phosphopyruvate-protein factor phosphotransferase
                      phosphoenolpyruvate sugar phosphotransferase enzyme I
                      sugar-PEP phosphotransferase enzyme I

17. 2.1.1.98 enzyme   S-adenosyl-L-methionine:2-(3-carboxy-3-aminopropyl)-L-histidine methyltransferase
                      diphthine methyltransferase
                      diphthine synthase
                      S-adenosyl-L-methionine:elongation factor 2 methyltransferase

18. 6.3.2.11 enzyme   L-histidine:beta-alanine ligase (AMP-forming)
                      carnosine synthase
                      carnosine synthetase
                      carnosine-anserine synthetase
                      carnosine-homocarnosine synthetase
                      homocarnosine-carnosine synthetase