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As a postdoctoral scholar, Özpolat was most interested in how worms made new gonads as part of this chain-like reproductive process.

Valenzuela's group is already at work on creating organoids from turtle gonads, to further investigate the underlying causes of sex determination.

The tests also found that adult male fish exposed to bifenthrin an cyhalothrin as larvae had smaller gonads than the control group, while the second generation had increased fecundity.

They are only one ingredient in a toxic stew that is literally hitting us in our collective gonads.

Some even retain their stomach contents and gonads.