Erythropoietin, a hypoxia-regulated factor, elicits a pro-angiogenic program in human mesenchymal stem cells - Zwezdaryk, K J; Coffelt, S B; Figueroa, Y G; Liu, J; Phinney, D G; LaMarca, H L; Florez, L; Morris, C B; Hoyle, G W; Scandurro, A B (Exp Hematol, 2007)