Differentiation and Development is the 15th volume in the continuing series under the title ""Miami Winter Symposia"". This volume summarizes the progress in selected areas of biochemistry and the insights into the molecular basis of biological phenomena. It is divided into 92 chapters that cover topics that represent logical sequel to previous symposia on cloning and genetic manipulation of recombinant DNA. The introductory chapters discuss the discovered RNA phages with particular emphasis on the use of specific and transformed cells to study cell formation and differentiation. Then, the developmental regulation of protein synthesis and hierarchical controls of nucleolar synthetic functions are discussed. This volume also explains the relationship between cellular events, as well as DNA folding and histone organization in chromatin. The effects of phage infection, DNA damage repair in mycoplasmas, and multiple chorion structural genes are also presented. This volume looks into the biological features occurring frequently in cell development and differentiation. It studies differentiation and development of various cancer cells and role of several biomolecules in these processes. It also discusses the 3-D structure of a DNA unwinding protein and the role of prostaglandins in cell proliferation and differentiation. The book explains milk proteins and genes during lactogenesis and induction of surface immunoglobulins by lipopolysaccharides. It also examines the genetic control of milk zinc availability and the development of adult muscles in Drosophila abdomen. The concluding chapters discuss the embryonic gene regulation and biochemical markers for hematopoietic cell differentiation. The origin and significance of tissue-specific histone variant patterns in mammals are explained. Finally, the book covers DNA sequence analysis of chicken ovalbumin gene. Cell biologists, scientists, and researchers, as well as biochemists, teachers, and students will find this book invaluable.