Physioxia improves the selectivity of hematopoietic stem cell expansion cultures nork Igarashi, KJ, Kucinski, I, Chan, YY, Tan, T-K, Khoo, HM, Kealy, D, Bhadury, J, Hsu, I, Ho, PY, Niizuma, K, Hickey, JW, Nolan, G, Bridge, KS, Czechowicz, A, Gottgens, B, Nakauchi, H, Wilkinson, AC