Fig. 1

Endometrial cells with endometriosis that have been successfully isolated from menstrual blood can be stained by using immunocytochemical techniques to examine the appearance of P450 aromatase. a–d Appear consecutively in the appearance of P450 aromatase with cell distribution, i.e. dark brown cells of 20–50%, 50–80%, > 80% and cells that do not show aromatase display P450