Abstract
The timing of morphogenetic events in the regenerating forelimb of the axolotl was investigated by rotation of limb coverings at well-defined stages in the regenerative process. Both the skin covering the stump and the epidermis covering the regenerate were manipulated independently and together as a unit. The results show that the transmission of morphogenetic information covers a broad range of regenerative stages. This morphogenetic information seems first to become irreversibly fixed in the regenerate by the stage of late bud. The regenerate is sensitive to stump influences at early stages of regeneration, but it becomes insensitive to stump influences by the stage of palette. Evidence is presented which implies that epidermis that covers the regenerate is capable of influencing morphogenesis.
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