A method for securing thymineless mutants from strains of E. coli.
D000630:Aminopterin / Q000494:pharmacology*; D004926:Escherichia coli / Q000235:genetics*; D009705:Nucleosides / Q000494:pharmacology*; D009711:Nucleotides / Q000494:pharmacology*; D013941:Thymine / Q000737:chemistry*
D009705:Nucleosides; D009711:Nucleotides; D000630:Aminopterin; D013941:Thymine
AMINOPTERIN/pharmacology; ESCHERICHIA COLI/genetics; NUCLEOSIDES AND NUCLEOTIDES/pharmacology; THYMINE/chemistry