UMUR N, VATANSEVER S, UMUR AS, OZBILGIN K, SELCUKI M. Analysis of the effects of inhibitor and activator systems (Smad’s proteins) of TGF- s on chick neural tube closure. Kafkas Univ Vet Fak Derg,  16 (3):  437-442,  2010. DOI: 10.9775/kvfd.2009.896