RESUMEN
The aim of the present study is to understand if EBs can generate neural rosette upon co-culture with chick embryo sornites. The mouse ES cells, line Royan Bi, were cultured in hanging drops to induce embryoid bodies [EBs] formation. Somites were isolated from the chick embryos and then embedded in alginate solution. Finally, alginate beads containing somites were co-cultured with EBs. RA was added to some EBs according to 2-12+12+ protocol Mean percentage of EBs containing early and late rosettes in somite, control and RA was 1456%, 2.6% and 0.0%, respectively and what is important to rosette formation in EBs was the preseice of neural inducing components as well as the time course of neural differentiation of EBs Chick embryonic somites can induce ES cells -derived EBs to generate rosttte structures with neuron formation capacity