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✋ Limb Bud Patterning

Three signaling centers pattern limb axes: AER (FGF) for proximal-distal, ZPA (Shh) for anterior-posterior, and dorsal ectoderm (Wnt7a) for dorsal-ventral. Morphogen gradients specify digit identity.

Promotes outgrowth
Anterior-posterior patterning
Dorsal-ventral polarity
Generation: 0
Limb Length: 0
Digits Forming: 0
PD Axis: -
AP Axis: -
Three Axes:
Proximal-Distal: FGF from AER maintains progress zone
Anterior-Posterior: Shh from ZPA patterns digits (1→5)
Dorsal-Ventral: Wnt7a induces Lmx1b in dorsal mesoderm
Digit identity = Shh concentration × exposure time