This issue of Progress in Brain Research is split over 2 volumes, bringing together cutting-edge research on functional neural transplantation. The 2 volumes review current knowledge and understanding, provide a starting point for researchers and practitioners entering the field, and build a platform for further research and discovery. – Leading authors review the state-of-the-art in their field of investigation, and provide their views and perspectives for future research- Chapters are extensively referenced to provide readers with a comprehensive list of resources on the topics covered- All chapters include comprehensive background information and are written in a clear form that is also accessible to the non-specialist