Biology / Bio 3359 · Atom · ~20 seconds
Vertebrate Axis Formation
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Vertebrate development establishes anterior-posterior and dorsal-ventral body axes early on, through signaling gradients that tell cells at each position which structures to form there.
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A signaling gradient stronger at one end of the embryo helps specify that end as anterior, or head-forming, tissue.
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Axis formation sets positional identity for later structures — it does not itself build any organ directly.