obtain these cells in quantity and purity for further study. Culture techniques have been optimized for managing the growth and differentiation of stem cells in vitro; as some stem cells are pluripotent, often the method is to guide the fate of such cells among the possible differentiation fates. Much of this work, and that in the classical model org- isms, has helped defne the aspects of the stem cell environment or niche that are crucial for both growth and differentiation, and these studies have moved in vivo at increasingly higher resolution. Importantly, the in vivo niche is a current target for bioengineering the matrix and signaling factors. Herein, we present methods for studying six types of mammalian stem cells, m- mary, neural, mesenchymal, endothelial, dendritic, and muscle.