ScienceDaily (Aug. 5, 2008) — Scientists at the University of Liverpool have identified an enzyme that could be responsible for a condition called endometriosis – the most common cause of pelvic pain in women. Endometriosis is a condition whereby patches of the inner lining of the womb appear in parts of the body other than the womb cavity. It can cause severe pain and affects approximately 15% of women of reproductive age. Endometriosis is also associated with infertility, with 50% of infertile women affected by the condition.