Mesenchymal stromal cells up-regulate CD39 and increase adenosine production to suppress activated T-lymphocytes - Saldanha-Araújo, Felipe; Ferreira, Flávia I. S.; Palma, Patrícia V.; Araújo, Amélia Goes; Queiroz, Regina Helena Costa; Covas, Dimas Tadeu; Zago, Marcos Antônio; Panepucci, Rodrigo Alexandre (Stem Cell Research, 2011)