RBC-Specific CD47 pruning confers protection and underlies the transient anemia in patients treated with anti-CD47 antibody 5F9 by Chen, J, McKenna, K, Choi, T, Duan, J, Brown, L, Stewart, J, Sompalli, K, Vyas, P, Schrier, S, Majeti, R, Weissman, I, Elrod, K, Chao, M, Takimoto, C, Liu, J, Volkmer, J