Noun
RNR (uncountable)
(biochemistry) ribonucleotide reductase
The RNR Air Branch was commissioned at RNAS Yeovilton on 16 July 1980, and shortly afterwards 38 ex-regular aircrew began refresher training. Source: Internet
The regulation of RNR and related enzymes maintains a balance of dNTPs relative to each other and relative to NTPs in the cell. Source: Internet