1. Hematology and Stem Cell Laboratory, Faculty of Pharmacy; Av. Ipiranga 2752, room 304G, Federal University of Rio Grande do Sul Porto Alegre RS Brazil
2. Stem Cell Laboratory, Fundamental Health Science Institute; Rua Sarmento Leite, 500, Federal University of Rio Grande do Sul Porto Alegre RS Brazil
3. Post Graduate Program in Physiology, Federal University of Rio Grande do Sul; Porto Alegre RS Brazil
4. Stem Cell Research Institute; Porto Alegre RS Brazil