title: Ultraviolet-induced reversion to prototrophy in histidine-requiring Escherichia coli B/r.
mesh_terms: D004260:DNA Repair / Q000528:radiation effects*; D004926:Escherichia coli / Q000235:genetics*; D006639:Histidine / Q000235:genetics; D010641:Phenotype; D013997:Time Factors; D014466:Ultraviolet Rays
chemical_list: D006639:Histidine