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RRM1, also named as RR1, belongs to the ribonucleoside diphosphate reductase large chain family. RRM1 provides the precursors necessary for DNA synthesis. RRM1 catalyzes the biosynthesis of deoxyribonucleotides from the corresponding ribonucleotides.RRM1 is a key enzyme in DNA synthesis: low level expression of RRM1 is associated with poor survival. RRM1 is a prognostic marker of NSCLC. The antibody is specfic to RRM1.