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Abstract
After treatment of primary roots ofVicia faba with N-nitroso-N-methylurea (NMU) and afterwards with N-nitroso-N-ethylurea (NEU) only an additive effect has been found. When NEU was used for the first treatment and NMU was applied afterwards an interaction of induced lesions was observed in the production of interchanges. These results might be interpreted as follows: NMU induces primary chromatid lesions in a later stage of interphase than NEU, so that these lesions cannot be induced in the same cell, if NMU is applied first. Because of the complexity of events leading to aberrations, a lot of which are unknown, our interpretation should be accepted with due reserve and cannot be more than a working hypothesis for further experimental tests.
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