Cell viability of endometrial stromal cells measured by MTT assay in eutopic endometrial stromal cells (A) and in ectopic endometrial stromal cells (B), treated for 24 hours with 10% peritoneal fluid, and then treated with mistletoe (200 ng/mL) for 24 hours (CON: media only for 24h, served as a standard, M: 200 ng/mL of mistletoe for 24h, CP+M: 10% of control peritoneal fluid for 24h, then treated with 200 ng/mL mistletoe for 24h, G1+M: 10% of peritoneal fluid from endometriosis stage I & II patients for 24h, then treated with 200 ng/mL mistletoe for 24h, G2+M: 10% of peritoneal fluid from endometriosis stage III & IV patients for 24h, then treated with 200 ng/mL mistletoe for 24h * P < 0.05).