vegetal-to-ectoderm signal

Inductive interactions:
vegetal-to-ectoderm signal

INDUCER:	vegetal half
TARGET:	mesomere tier
STAGE:	mid-cleavage, may be 3d cleavage
INDUCTION OUTCOME:	differentiation of oral ectoderm, and possibly aboral ectoderm as well
PROOFS:	Cultured mesomere tiers failed to form stomadeum or ciliated band, while addition of macromeres yields normal oral morphology with a polarized pattern of Ecto V expression
SPECIES:	Lytechinus pictus, Strongylocentrotus purpuratus
COMMENTS:	One micromere contacts with one or two of veg2 blastomeres, thus they must communicate with one another
REFERENCE:	Wikramanayke et al., 1995