Retinoic acid promotes the generation of pancreatic endocrine progenitor cells and their further differentiation into beta-cells. oleh Maria Oström, Kelly A Loffler, Sara Edfalk, Lars Selander, Ulf Dahl, Camillo Ricordi, Jongmin Jeon, Mayrin Correa-Medina, Juan Diez, Helena Edlund