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Upon the completion of the developmental stages of regeneration, when the regenerative organ known as the blastema completes patterning and differentiation, the limb regenerate is proportionally small in size. It then undergoes a phase of regeneration that we have called the \u2018tiny-limb\u2019 stage, which is defined by rapid growth until the regenerate reaches the proportionally appropriate size. In the current study we have characterized this growth and have found that signaling from the limb nerves is required for its maintenance. Using the regenerative assay known as the accessory limb model (ALM), we have found that growth and size of the limb positively correlates with nerve abundance. We have additionally developed a new regenerative assay called the neural modified-ALM (NM-ALM), which decouples the source of the nerves from the regenerating host environment. Using the NM-ALM we discovered that non-neural extrinsic factors from differently sized host animals do not play a prominent role in determining the size of the regenerating limb. We have also discovered that the regulation of limb size is not autonomously regulated by the limb nerves. Together, these observations show that the limb nerves provide essential cues to regulate ontogenetic allometric growth and the final size of the regenerating limb.<\/jats:p>","DOI":"10.7554\/elife.68584","type":"journal-article","created":{"date-parts":[[2021,11,15]],"date-time":"2021-11-15T07:15:35Z","timestamp":1636960535000},"update-policy":"https:\/\/doi.org\/10.7554\/elife.68584","source":"Crossref","is-referenced-by-count":55,"title":["Neural control of growth and size in the axolotl limb regenerate"],"prefix":"10.7554","volume":"10","author":[{"given":"Kaylee M","family":"Wells","sequence":"first","affiliation":[{"name":"Biology Department, University of Massachusetts, Boston","place":["Boston, United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kristina","family":"Kelley","sequence":"additional","affiliation":[{"name":"Biology Department, University of Massachusetts, Boston","place":["Boston, United 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