has_component controlled content diet N-propyl-N-nitrosourea controlled N-propyl-N-nitrosourea content diet 2014-04-17T12:42:14Z A solid diet in which the amount of N-propyl-N-nitrosourea (PNU) is maintained at a specified level. PNU is a mutation-inducing chemical with three major moieties, a propyl group (-C3H7), a nitroso group (R-N=O) and a urea group (two -NH2 groups joined by a carbonyl (C=O) functional group). XCO:0000436 controlled 1-nitroso-1-propylurea content diet controlled 1-propyl-1-nitrosourea content diet controlled PNU content diet controlled propylnitrosourea content diet experimental_condition_ontology jsmith