A number of ELISA Kits are available that target ribonucleotide reductase M2, an alias of the protein, ribonucleotide reductase regulatory subunit M2. The human protein, encoded by the gene RRM2, is an enzyme and member of the Ribonucleoside diphosphate reductase small chain family. The protein's cellular localization is indicated to be cytoplasmic. Additional synonyms or past names for this protein may include: R2, RR2, RR2M. Homology is conserved in other species, such as Mouse, Rat, Frog.