REGENERATIVE CELLS IN ANIMALS. “A single haematopoietic stem cell can reconstitute the entire haematopoietic system of an irradiated mammal. Progenitor cell populations have been identified within most mammalian organs, including skin, blood, bone, reproductive tissues, skeletal muscle, kidney, lung, liver, intestine, heart and brain.”
http://onlinelibrary.wiley.com/doi/10.1111/j.1469-8137.2010.03360.x/full