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. . . the apical ectodermal ridge and a subjacent vascular channel. Integrity of the apical ectodermal ridge is essential for continued limb outgrowth.

At higher magnification . . .

 

 
                     Species: Mouse 
                     Day Gestation: 11 
             Approx. Human Age: 33 days 
                                   View: Lateral & Transverse Cut
 
                 Limb Development
                                     18a of 26