Animal Cell Technology is a growing discipline of cell biology which aims not only to understand structures, functions and behaviours of differentiated animal cells, but also to ascertain their abilities to be used in industrial and medical purposes. The goal of animal cell technology includes accomplishments of clonal expansion of differentiated cells with useful ability, optimizationi of their culture conditions, modulation of their ability for production of medically and pharmaceutically important proteins and the application of animal cells to gene therapy, artificial organs and functional foods. This volume gives the readers a complete review of present state-of-the-art in Japan and other countries where this field is well advanced. The Proceedings will be useful for the cell biologists, biochemists, molecular biologists, immunologists, biochemical engineers and other disciplines related to animal cell culture, working in eithre academic environments or in industries of biotechnology and pharmacy.