PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 25375241-1 2014 Ribonucleotide reductase (RNR) enzyme is composed of the homodimeric RRM1 and RRM2 subunits, which together form a heterotetramic active enzyme that catalyzes the de novo reduction of ribonucleotides to generate deoxyribonucleotides (dNTPs), which are required for DNA replication and DNA repair processes. Parathion 234-239 ribonucleotide reductase catalytic subunit M1 Homo sapiens 69-73