31.   The hormones estrogen and testosterone have been linked to the human sex drive.

32.   The hormone estrogen helps slow the breakdown of bone.

33.   The ovaries also produce the female hormones estrogen and progesterone.

34.   The question has been whether the high levels of phytoestrogens found in soy, similar to the female hormone estrogen, may affect the reproductive system later in life.

35.   Theory hold that these substances -- introduced into our lakes, water supplies and overall environment -- are creating synthetic hormones that mimic the female hormone estrogen.

36.   These cancers depend on the hormone estrogen to grow.

37.   Two-thirds of all breast cancers are ER-positive, which means they need the hormone estrogen to grow.

38.   Using a new test developed at Tufts University School of Medicine, they are attempting to detect and measure contaminant chemicals that mimic the action of the hormone estrogen.

39.   When amenorrhea occurs, the level of the female hormone estrogen drops and there is rapid loss of bone mass, a condition called osteoporosis.

40.   When the hormone estrogen is switched off, bones become more breakable.