title: Constitutivity of thymidine phosphorylase in deoxyriboaldolase negative strains: dependence on thymine requirement and concentration.
mesh_terms: D002262:Carboxy-Lyases; D004794:Enzyme Repression; D004926:Escherichia coli / Q000201:enzymology*; D005827:Genetics, Microbial; D005838:Genotype; D009154:Mutation; D009711:Nucleotides / Q000378:metabolism; D010429:Pentoses / Q000378:metabolism; D012486:Salmonella typhimurium / Q000201:enzymology*; D013936:Thymidine; D014166:Transferases / Q000378:metabolism*
chemical_list: D009711:Nucleotides; D010429:Pentoses; D014166:Transferases; D002262:Carboxy-Lyases; D013936:Thymidine