Reference; Ruiz i Altaba, A. (1992). Planar and vertical signals in the induction and patterning of the Xenopus nervous system. Development 115, 67-80.
Ruiz i Altaba, A. and Jessel, T.M. Pintallavis, a gene expressed in the organizer and midline cells of frog embryos: involvement in the development of the neyral axis. Development 116, 81-93
