“…The mRNA, protein, and/or activity of P 450 Arom have been shown in eutopic and/or ectopic endometria of women with endometriosis by several investigators using diverse techniques (4,17,20,21,23,33); recently, Colette et al (34) detected only low levels in ectopic endometrium. The cellular location of P 450 Arom is controversial because some investigators found it mainly in the glandular and superficial epithelia (4,35,36), others in the stromal cell compartment (4,13,14), or in both (22,37).…”