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Endometriosis, light micrograph of section of affected tissue. Endometriosis is a gynecological condition in which cells from the lining of the uterus (endometrium) (red) appear and flourish outside the uterine cavity, most commonly on the membrane which lines the abdominal cavity, the peritoneum. Symptoms of endometriosis are pain and infertility. Magnification: x 150 when printed at 10 centimetres across. Human tissue (KEYSTONE/SCIENCE PHOTO LIBRARY/STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY)