TY  - GEN
AU  - Nieuwkoop,P.D.
TI  - Are there direct relationships between the cortical layer of the fertilized egg and the development of the future axial system in Xenopus laevis embryos?
PY  - 1956///
CY  - [S.l.
PB  - s.n.], 
N1  - Tav. di studio SZN
ER  -