title: A ribonuclease I deficient mutant (MB24) of Salmonella typhimurium.
mesh_terms: D009154:Mutation; D012260:Ribonucleases / Q000378:metabolism*; D012486:Salmonella typhimurium / Q000201:enzymology* / Q000302:isolation & purification
chemical_list: D012260:Ribonucleases