A–F: Hydrogen peroxide production was measured after treating cells with danazol, 250 μmol/L; RU-486, 100 μmol/L; or NAC, 6.4 mmol/L. Proliferation of cells treated during 48 hours with danazol, RU-486, or NAC was measured by thymidine incorporation. Results are expressed as a ratio between treated and untreated cells. Red dotted line shows the level of untreated cells. Error bars represent SEM. G–N: Mouse model of endometriosis. Macroscopic implants and histology after extraction with pathology score of mice treated with PBS (G and H), danazol (I and J), RU-486 (K and L), and NAC (M and N). Original magnification, ×100.