1. Receptor Serine Kinases and Signaling by Activins and Inhibins -- 2. The Gene Expression of Activin Receptors in Rat Pituitary -- 3. Follistatin Physiology and Potential Mechanisms of Action in the Human -- 4. Inhibins, Activins, Follistatin, and GnRH: Regulators of Gonadotropin Subunit Gene Expression -- 5. Inhibin and Activin as Paracrine Regulators of Gonadal Function: In Vitro Model Systems -- 6. Production and Actions of Inhibin, Activin, and Follistatin in the Pituitary and Ovary -- 7. Expression of Inhibin Subunits, Follistatin, and Activin Receptors in Normal Testicular Cells and Testicular Tumors -- 8. Inhibin, Activin, and Follistatin: Observations on Their Role in the Physiology of Pregnancy -- 9. Changes of Activin A Secretion in Gestational Diseases -- 10. Two-Site Immunoassay for Native Inhibin A -- 11. Ultrasensitive Enzyme Immunoassays for Inhibins and Activins -- 12. Immunoassays for Activin and Follistatin: Results in Normal and Diseased Subjects -- 13. Circulating Inhibin -- 14. Evaluation of Matemal Serum Inhibin as a Marker for Complicated Pregnancy -- 15. Production of Inhibin-Related Peptides by Ovarian Tumors -- 16. Plasma Inhibin and Activin in Disease -- 17. Activin A: A Commitment Factor in Erythroid Differentiation -- 18. Effect of Activin A on the Formation of Pancreatic Endocrine Cells -- 19. The Role of Activin in Spermatogenesis in Fish -- 20. Control of Cell Differentiation and Morphogenesis by Activins During Early Amphibian Development -- 21. Neural Induction in the Frog Xenopus laevis -- 22. Transgenic Approaches to Study the Functions of the Transforming Growth Factor-? Superfamily Members -- 23. Activin Signaling Pathways and Their Role in Xenopus Mesoderm Formation -- 24. Activin Signal Transduction and the Role of TGF-? Superfamily in Cell Differentiation -- 25. The Role of Follistatin in Activin Signal Transduction -- 26. Transforming Growth Factor-? Receptors and Signal Transduction -- Short Communications from the Poster Session -- 27. Cytokine Inhibits Inhibin A Secretion in Cultured Rat Granulosa Cells -- 28. Mitosis and Inhibin Production in Ovarian Follicular Granulosa Cells During the Estrous Cycle of Rats -- 29. Induction of G1 Arrest by Activin A via Cooperative Modulation of Cyclin D2 and p21CIP1/WAF1 in Hybridoma Cells -- 30. Pharmacological Analysis of the Neurotrophic Effect of Activin -- 31. A Follistatin-Like Gene, mac25, as a Tumor Suppressor -- 32. Expresssion of Activin ?-Subunit and Type II Receptor Genes During Newt Spermatogenesis -- 33. Analysis of the Response of Human Embryonal Carcinoma Cells to Aetivin A -- 34. Regulation of Angiogenesis by TGF-? Superfamily -- Author Index