Chemically defined cytokine-free expansion of human haematopoietic stem cells by Sakurai, M, Ishitsuka, K, Ito, R, Wilkinson, AC, Kimura, T, Mizutani, E, Nishikii, H, Sudo, K, Becker, HJ, Takemoto, H, Sano, T, Kataoka, K, Takahashi, S, Nakamura, Y, Kent, DG, Iwama, A, Chiba, S, Okamoto, S, Nakauchi, H, Yamazaki, S