List of contributors; Foreword; Introduction; Part I. Control of Germ Cell Proliferation and Differention: Differentiation, growth and maturation of oocytes A. G. Byskov; GnRH-induced rat oocyte maturation: a calcium dependent process S. Goren, Y. Oron and N. Dekel; A G1-specific spermatogonial chalone E. Bustos-Obregon, J. Balbontin and P. Arenas; Cellular function of proto-oncogenes G. Cooper; Characteristics of the expression of the cc-abl and c-mos proto-oncogenes in mouse germ cells A. G. Wadewitz and D. J. Wolgemuth; Part II. Mechanisms of Hormone Action: Mechanisms of action of estrogenes and antiestrogens J. Gorski; Are receptor-associated nuclear proteins associated with the earliest effects of steroid hormones? E. E. Baulieu; Hormonal control of gene expression in the ovary J. S. Richards; The hormonal control of human luteal cells H.-Z. Wang; Part III. Local Regulatory Processes: Ovarian insulin-like growth factor 1: basic and clinical implications E. Y. Adashi; Isolation and characterization of growth factors from porcine ovarian follicular fluid M. Yamamoto; Paracrine mechanisms in the regulation of testicular function D. M. De Kretser; Stage-specific regulation of spermatogenesis M. Parvinen; Multiple regulation of leydig cell functions F. F. G. Rommerts; Stimulation of leydig cell steroidogenesis by a factor from human ovarian follicular fluid S. A. Khan, C. Keck and E. Nieschlag; Intrafollicular roles of inhibin, interferon-A related peptides J. K. Findlay; The inhibin/activin family and proopiomelanocrotin-derived peptides as intratesticular regulators of cellular function P. L. Morris; Modulation of FSH by low-molecular-weight synthetic fragments of human seminal inhibin A. R. Sheth; Transforming growth factor beta and related peptides: a role in testicular intercellular communication M. Benahmed; Epidermal growth factor (EGF) in human ovarian follicular fluid L. G. Westergaard and C. Y. Andersen; The brain renin-angiotensin system and the secretion of anterior pituitary hormones in the rat M. K. Steele; Renin and angiotensin formation and action in the ovary M. Alam; Part IV. Extracellular Matrix and Cell Differentiation: The influence of extracellular matrix and cell-cell interactions on the secretory activity of sortoli cells A. Steinberger; The influence of ovarian granulosa cell factors on the proliferation and differentiation of endothelial cell R. D. Koos; Part V. Lymphokines and the Endocrine System: The role of interleukin-1 in reproduction M. L. Polan; The role of peritoneal macrophages and their secretory products in endometriosis-associated infertility J. Halme, S. Sporn and S. Haskill; Part VI. New Leads for Fertility Regulation Research: Summary of the Symposium: Focus on growth regulatory factors for new leads in fertility regulation research E. Diczfalusy.