| 31. | Scientists suspect that such female sex hormones as progesterone and estrogen aggravate the condition.
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| 32. | One theory is that female sex hormones play a role.
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| 33. | The third group, the sex hormones, are also produced by the testes and ovaries.
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| 34. | This was initially to study sex hormones of the octopus.
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| 35. | Androgens are male sex hormones, with testosterone the best known.
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| 36. | The prototypical progestogen is progesterone, an endogenous sex hormone.
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| 37. | They theorize that female sex hormones may play a role in susceptibility to the arrhythmia.
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| 38. | The sex hormones testosterone and estradiol also regulate aggression.
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| 39. | Gender-related differences may suggest a role for sex hormones.
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| 40. | Still, they do what sex hormones typically do, influence behavior as well as the body.
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