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N -Ethyl- N -nitrosourea (ENU) (C 3 H 6 N 3 O 2 ) in 1g isopac (Sigma N 3385). One isopac is sufficient for treatment of 50 fish. Use a new isopac for each treatment ( see Note 6 ), preferably from the same production batch for one mutagenesis experiment ( see Note 7 ). Isopacs are stored at −20¡ãC. WARNING : ENU is extremely hazardous ( see Subheading 3 ).


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