What could be the explanation?

The researchers’ theory is that atrazine may increase the levels of an enzyme called aromatase. This enzyme converts testosterone, the male sex hormone, to estrogen, the female sex hormone.

This would explain why blood levels of testosterone in atrazine-treated male frogs are so low.

But, this hypothesis needs to be tested to see if aromatase levels are actually higher in atrazine-treated frogs.

Does this potential hormone disruption have any implication for humans?