with the aim to test the hypothesis that cells derived from the mesencephalic portion of the neural crest , are involved in the process of differentiation of various upper facial bones , in 41 chick embryos of the 6-somite stage ( approx . 26 hours of incubation ) the anterior and middle thirds of this part of the neural crest were partially eliminated by micro-laser irradiation , either unilaterally or bilaterally .
C0007634
cells
C0007589
differentiation