Inductive interactions:
veg1-to-veg1 signal

TARGET: veg1
STAGE: Mid-cleavage - mid-blastula
INDUCTION OUTCOME: promotion of endoderm gene expression within the veg1 domain
PROOFS: A single veg2 blastomere combined with veg1 tier in veg1-mesomere recombinants suffices in some embryos for the formation from the veg1 cells of a complete archenteron
SPECIES: Strongylocentrotus purpuratus
COMMENTS: One veg2 blastomere contacts with one or two of veg1 blastomeres, thus they must communicate with one another
REFERENCE: Logan and McClay, 1998

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