title: Selective isolation of a thymine-requiring mutant of phage T4.
mesh_terms: D000630:Aminopterin; D003090:Coliphages / Q000302:isolation & purification / Q000378:metabolism*; D003470:Culture Media; D008722:Methods; D009154:Mutation; D013941:Thymine / Q000378:metabolism*
chemical_list: D003470:Culture Media; D000630:Aminopterin; D013941:Thymine