( ), -. Danio (zebrafish) TGF-beta: bone morphogenetic protein (BMP) Nodal. BMP/Nodal , , . , , Danio BMP Nodal. , , , , (. .). , , , , . ( ) , BMP Nodal. . , , . , BMP Nodal, - , , - - , , , . - . "" , BMP, Nodal. , , .
, , : . , (, ).
:
A
B , sonic hedgehog
C, D, E (i, ) (ii, ) . : e, ; fp, floorplate ( ); h, ; hg, ; n, ; mb, ; hpf, .
:
Xu et al.