Inductive interactions:
veg2-to lower-veg1 signal

TARGET: veg1
STAGE: Mid-cleavage - mid-blastula
INDUCTION OUTCOME: specification of endodermal veg1 components
PROOFS: veg2 + mesomere combinations generate a complete tripartite gut, in contrast, veg1 cannot similarly recruit mesomeres and, if combined with mesomeres, it, at best produces a small invagination
SPECIES: Lytechinus variegatus
REFERENCE: Logan and McClay, 1998

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