Fig. 6. Partial redundancy between the TAK1/NLK and the MEK/ERK signalling pathways. (A-R) Embryos were injected at the egg stage with the indicated reagents, treated or not with U0126 starting at the two-cell stage. In situ hybridization was performed for gcm (G-L) and papss (M-R). (A,G,M) Control embryos (B,D,F,H,J,L), U0126-treated embryos (C,D,I,J,O,P). Embryos injected with a morpholino oligonucleotide against nlk (Mo-nlk) or against tak1 (Mo-TAK1) (E,F,K,L,Q,R). (A-F) Early pluteus, (G-R) gastrula. vv, vegetal pole view.