This textbook describes the biology of different adult stem cell types and outlines the current level of knowledge in the field. It clearly explains the basics of hematopoietic, mesenchymal and cord blood stem cells and also covers induced pluripotent stem cells. Further, it includes a chapter on ethical aspects of human stem cell research, which promotes critical thinking and responsible handling of the material. Based on the international masters program Molecular and Developmental Stem Cell Biology taught at Ruhr-University Bochum and Tongji University Shanghai, the book is a valuable source for postdocs and researchers working with stems cells and also offers essential insights for physicians and dentists wishing to expand their knowledge. This textbook is a valuable complement to Concepts and Applications of Stem Cell Biology, also published in the Learning Materials in Biosciences textbook series.