Contamination of Mesenchymal stem-cell with fibroblasts accelerates neurodegeneration in an experimental model of Parkinson´s disease - Pereira, Marcia C. L; Secco, Mariane; Suzuki, Daniela E; Janjoppi, Luciana; Rodini, Carolina O; Torres, Layla B; Araújo, Bruno H. S; Cavalheiro, Esper A; Zatz, Mayana; Okamoto, Oswaldo Keith (Stem Cell Reviews and Reports, 2011)