在体内用氮芥处理的小鼠F2代中发现。在原种群中,穿透率较高,但在杂交后代中则低且变异性大。 (From: "Observation of a recessive trait in mice following in utero exposure to mustard gas.")
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Found in the F2 generation from mice treated in utero with nitrogen mustard. Penetrance is high in the original stock, but low and variable in descendants of outcrosses.