title: [Ribonucleotide reductase system].
mesh_terms: D000818:Animals; D004926:Escherichia coli / Q000201:enzymology; D007778:Lactobacillus / Q000201:enzymology; D009711:Nucleotides / Q000378:metabolism*; D010088:Oxidoreductases / Q000378:metabolism*; D014805:Vitamin B 12 / Q000378:metabolism
chemical_list: D009711:Nucleotides; D010088:Oxidoreductases; D014805:Vitamin B 12