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In page Congenital absence of the vas deferens:

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The vas deferens connect the sperm-producing testicles to the penis. Therefore, those who are missing both vas deferens are typically able to create sperm but are unable to transport them appropriately. Their semen does not contain sperm, a condition known as azoospermia.[citation needed] Unilateral absence may not show any abnormalities in semen analysis.