Ranera, B. Remacha, A. R. Álvarez-Arguedas, S. Castiella, T. Vázquez, F. J. Romero, A. Zaragoza, P. Martin-Burriel, I. Rodellar, C. Expansion under hypoxic conditions enhances the chondrogenic potential of equine bone marrow-derived mesenchymal stem cells Vet. j. 10.1016/j.tvjl.2012.06.008 2013 2013