<p>This domain is found at the N terminus of bacterial ribonucleoside-diphosphate reductases (ribonucleotide reductases, RNRs) which catalyse the formation of deoxyribonucleotides [<cite idref="PUB00005954"/>]. It occurs together with the RNR all-alpha domain (<db_xref db="INTERPRO" dbkey="IPR013509"/>) and the RNR barrel domain (<db_xref db="INTERPRO" dbkey="IPR000788"/>). </p> Ribonucleotide reductase N-terminal