Clue to cause of endometriosis

They believe overproduction of an enzyme called telomerase, which plays a role in cell division, may be responsible.

Endometriosis results in patches of the womb's lining growing into other parts of the body. It can cause severe pain, heavy periods and infertility.

Doctors are hoping the study in the journal Human Reproduction leads to new ways to diagnose and treat the condition.

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