What characterizes the earliest stem cell? What is true for human stem cells? (Discussion)

T. Papayannopoulou, C. Eaves, J. E. Dick, P. M. Lansdorp, E. D. Zanjani, R. Hoffman, S. J. Sharkis, L. Kanz, B. Torok-Storb, G. J. Spangrude, M. A.S. Moore, H. E. Broxmeyer