1 23 In Vitro Cellular & Developmental Biology - Animal ISSN 1071-2690 Volume 47 Number 10 In Vitro Cell.Dev.Biol.-Animal (2011) 47:681-688 DOI 10.1007/s11626-011-9459-7 Design of a controlled release system of OP-1 and TGF-β1 based in microparticles of sodium alginate and release characterization by HPLC-UV Ricardo Oliva-Rodríguez, José Pérez- Urizar, Estela Dibildox-Alvarado, Ma. Consolación Martínez-Saldaña, Francisco Javier Avelar-González, et al.