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- W1961131527 abstract "We have analyzed the morphology of over 5000 Ti1 pioneer growth cones labeled with anti-HRP, which reveals the disposition of axons, growth cone branches, and filopodia. Ti1 axon pathways typically consist of a sequence of 7 characteristically oriented segments, with a single, distinct reorientation point between each segment. Growth cones exhibit the same orientations and reorientations in a given region as do axon segments at later stages. The single, distinct reorientations suggest that growth cones make discrete switches between guidance cues as they grow. Ti1 growth cones are guided by various types of cues. A set of 3 immature identified neurons serves as nonadjacent guidepost cells and lies at the proximal end of 3 of the axon segments. To form another segment, growth cones reorient along a limb segment boundary within the epithelium. Growth cones also respond consistently to, and orient toward, a specific mesodermal cell, which may be a muscle pioneer. Thus, growth cones respond to at least 3 different types of cells in the leg. Ti1 growth cones exhibit a hierarchy of affinity for these cues. Guidepost neurons are the dominant cues in that contact with them reorients growth cones from guidance by the other types of cues. Growth cone branches are exclusively oriented to specific cues. Growth cones reorient by extending a branch directly to the cue of highest affinity and by withdrawing any branches that are extended to a cue of lesser affinity. A single filopodium in direct contact with a guidepost neuron can reorient a growth cone that still has multiple filopodia or even prominent branches specifically oriented to a previous cue of lesser affinity. These observations suggest that growth cone steering may not result simply from passive adhesion and filopodial traction, but may involve more active processes." @default.
- W1961131527 created "2016-06-24" @default.
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- W1961131527 date "1986-06-01" @default.
- W1961131527 modified "2023-10-05" @default.
- W1961131527 title "Pioneer growth cone steering along a series of neuronal and non- neuronal cues of different affinities" @default.
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- W1961131527 doi "https://doi.org/10.1523/jneurosci.06-06-01781.1986" @default.
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