... successive embryos, and thus could repeatedly incorporate in the same segments of the axis. Together, these lineage analyses and transplantation studies provide evidence that at least some long-term axial progenitors are stem cells. Mouse Rostrocaudal axis Axial elongation Stem cells Node...

... the rostrocaudal axis at various developmental stages, we have found that the capacity of rhombomeres to generate somatic motoneurones is labile at the neural plate stage but becomes fixed just after neural tube closure, at stage 10-11. Grafting of somites or retinoic acid-loaded beads beneath the rostral...

... about three hours after their formation. (2) When the transplantation reversed only the rostrocaudal axis, two days after the operation the rudiments of dorsal root ganglia were formed at the caudal (originally rostral) halves of the transplanted sclerotomes. The rostrocaudal axis of the somites had...