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Mutant SCs fail to spread on fragmentary BL during development<jats:italic>in vivo<\/jats:italic>, and this is phenocopied by SCs lacking functional FAK on low laminin (LN)<jats:italic>in vitro<\/jats:italic>. Furthermore, SCs without functional FAK initiate differentiation prematurely, both<jats:italic>in vivo<\/jats:italic>and<jats:italic>in vitro<\/jats:italic>. In contrast to their behavior on high levels of LN, SCs lacking functional FAK grown on low LN display reduced spreading, proliferation, and indicators of contractility (i.e., stress fibers, arcs, and focal adhesions) and are primed to differentiate. Growth of SCs lacking functional FAK on increasing LN concentrations<jats:italic>in vitro<\/jats:italic>revealed that differentiation is not regulated by G<jats:sub>1<\/jats:sub>arrest but rather by cell spreading and the level of contractile actomyosin. The importance of FAK as a critical regulator of the specific response of developing SCs to fragmentary BL was supported by the ability of adult FAK mutant SCs to remyelinate demyelinated adult nerves on mature BL<jats:italic>in vivo<\/jats:italic>. We conclude that FAK promotes the spreading and actomyosin contractility of immature SCs on fragmentary BL, thus maintaining their proliferation, and preventing differentiation until they reach high density, thereby promoting radial sorting. Hence, FAK has a critical role in the response of SCs to limiting BL by promoting proliferation and preventing premature SC differentiation.<\/jats:p>","DOI":"10.1523\/jneurosci.1764-14.2014","type":"journal-article","created":{"date-parts":[[2014,10,1]],"date-time":"2014-10-01T16:52:49Z","timestamp":1412182369000},"page":"13422-13434","source":"Crossref","is-referenced-by-count":47,"title":["FAK Is Required for Schwann Cell Spreading on Immature Basal Lamina to Coordinate the Radial Sorting of Peripheral Axons with Myelination"],"prefix":"10.1523","volume":"34","author":[{"given":"Matthew","family":"Grove","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peter 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