OntologiesgoclassesGO:0008193   
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tRNA guanylyltransferase activity
http://purl.obolibrary.org/obo/GO_0008193

Catalysis of the posttranscriptional addition of a guanyl residue to the 5' end of a tRNA molecule; observed for His tRNAs.

Also appears ingexoccoretorexo