Valproic acid confers functional pluripotency to human amniotic fluid stem cells in a transgene-free approach by Moschidou, D., Mukherjee, S., Blundell, M.P., Drews, K., Jones, G.N., Abdulrazzak, H., Nowakowska, B., Phoolchund, A., Lay, K., Ramasamy, T.S., Cananzi, M., Nettersheim, D., Sullivan, M., Frost, J., Moore, G., Vermeesch, J.R., Fisk, N.M., Thrasher, A.J., Atala, A., Adjaye, J., Schorle, H., De Coppi, P., Guillot, P.V.