1.   And if their growth was stimulated by estrogen, the doctor could be given hormonal therapy instead of chemotherapy.

2.   Breast development is stimulated by estrogen, which is released from the ovaries upon a hormonal signal from the pituitary gland.

3.   Estrogen stimulates the breast cells to divide and proliferate, and with every additional cell division comes a chance for errors to creep into the genetic material.

4.   Estrogen also stimulates the activity of brain cells that release a major chemical messenger, acetylcholine.

5.   Taking estrogen stimulates activity in areas of the brain known to control memory, according to a study published this week.

6.   Although the study did not find memories had improved, researchers said estrogen may stimulate the brain to make the type of neural connections typically seen in younger people.

7.   Barnes said there is no evidence that they promote cancers stimulated by estrogen.

8.   Estrogen may stimulate the brain to repair itself or increase cerebral blood flow and cerebral glucose use, it says.