Molecular Control of Proliferation and Differentiation documents the proceedings of the 35th symposium of The Society for Developmental Biology entitled "Molecular Control of Proliferation and Differentiation," held at Asilomar, Monterey Peninsula, California, June 8-11, 1976. The contributions made by researchers at the symposium are organized into seven parts. Part I presents a paper on cell communication in embryological development. Part II includes studies on growth factors, including fibroblast growth factor and epidermal growth factor. Part III examines the factors affecting nerve cell differentiation and function. It includes papers on nerve growth factor and peptides as central nervous system neurotransmitters. Part IV focuses on cell interactions in blood cell development. It includes studies on factors affecting the differentiation of blood cells and the proliferation of hemopoietic stem cells in vitro. Part V examines cell interactions in the immune system. Part VI deals with cell interactions in organogenesis. Part VII covers the factors effecting differentiation in lower eukaryotes.