Intercalary Regeneration in Larval Ambystoma Limbs: The Origin of Skeletal Structures and The Non-Segmental Organization of Morphogenetic Information
Urodele limbs are able to regulate for intercalary deletions created when distal regeneration blastemas are grafted to a more proximal level. Using several morphological markers, pigmentation differences between white and dark axolotls, and the difference in nucleolar number between diploid and triploid animals, I show that the entire intercalary regenerate is derived from the stump when wrist or tarsus blastemas are grafted to the mid-stylopodium of the fore- or hindlimb. The transplanted prospective autopodium forms no more than would be expected in situ. Thus, the rule of distal transformation is not violated during intercalary regeneration in salamanders.
University of Illinois - Urbana-Champaign
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University of Illinois at Urbana-Champaign