BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY
Colour enhanced illustration of a man with Klinefelter's syndrome. Such men have three sex chromosomes (XXY) and therefore have greatly reduced fertility. They have small testes, normal sperm production fails (azoospermia), and there may be enlargement of the breasts (gynaecomastia) and an absence of facial or body hair. Additionally, affected males may have learning disabilities and/or behaviour problems.
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