High Frequency of Thyroid Tumor Induction by N‐Methyl‐N′‐nitro‐N‐nitrosoguanidine in the Hermaphroditic Fish Rivulus marmoratus

In the self‐fertilizing hermaphroditic fish, Rivulus marmoratus, the susceptibility to tumor induction by N‐methyl‐N‐nitro‐N‐nitrosoguanidine(MNNG) was evaluated. Seven‐day‐old fish larvaewere exposed for 2 h toMNNG at concentrations ranging from 5 to 25 ppm in a static water bath. The exposed fish...

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