sciencehabit writes: If you're trying to avoid getting pregnant, here's another reason to mistrust the rhythm method of birth control: New research confirms that the fluid in semen, long dismissed as primarily a vehicle for sperm, contains a substance that can trigger ovulation and other pregnancy-supporting hormonal responses in female mammals. The substance is a protein that's crucial to the development and survival of sensory neurons: neural growth factor, or NGF.The find could lead to new fertility treatments in humans.
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