Immunomodulation with pentoxifylline abrogates macrophage-mediated infertility in an in vivo model: a paradigm for a novel approach to the treatment of endometriosis-associated subfertility**Supported in part by Hoechst-Roussel Pharmaceuticals, Inc, Sommerville, New Jersey, and the Reproductive Biology Research Foundation, Torrance, California.††Presented as the Squibb Prize Paper at the 1990 Meeting of the Pacific Coast Fertility Society, Scottsdale, Arizona, April 25 to 29, 1990.