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| Histidine-tRNA Ligase Histidyl T RNA Synthetase | His-tRNA Ligase | Histidyl-tRNA Synthetase | Jo-1 Antigen | Antigen, Jo-1 | His tRNA Ligase | Histidine tRNA Ligase | Histidyl tRNA Synthetase | Jo 1 Antigen | Ligase, His-tRNA | Ligase, Histidine-tRNA An enzyme that activates histidine with its specific transfer RNA. EC 6.1.1.21. |