... Hypothalamus Chick embryo Somites Wing bud Wellcome Trust http://dx.doi.org/10.13039/100010269 212247/Z/18/Z 202756/Z/16/Z Engineering and Physical Sciences Research Council http://dx.doi.org/10.13039/501100000266 Developmental biology studies rely on the accurate staging...

... polarizing activity wing bud leg bud polarizing region chick embryo The specification of the anteroposterior pattern of the avian wing is controlled by a small region of mesenchyme cells at the posterior border of the developing limb bud ( Saunders and Gasseling, 1968 ). Tissue of a stage 20 limb...

...William L. Todt; John F. Fallon ABSTRACT The ability of the anterior apical ectodermal ridge to promote outgrowth in the chick wing bud when disconnected from posterior apical ridge was examined by rotating the posterior portion of the stage-19/20 to stage-21 wing bud around its anteroposterior...

...D. J. Wilson; J. R. Hinchliffe ABSTRACT Removal of the posterior half of the chick wing bud between stages 17-22 results in failure of the anterior distal tissue to survive and differentiate. This observation has been interpreted in terms of a requirement by the anterior half of a factor supplied...

... muscle was markedly reduced in HH stage-12 and -15 isolated wing regions while myogenesis in HH stage-18 and -21 wing buds was not affected by the absence of the somitic tissues. These results are consistent with reported stages of somitic cell migration into wings with the exception of HH stage-12...

... activity in the chick wing bud based on a bioassay that provides a quantitative measure of the completeness of the additional structures (the strength of activity index). Activity is first detected prior to the initial appearance of the limb primordium as early as Hamburger & Hamilton stage 14...

.... 08 10 1984 Copyright © 1985 by Company of Biologists 1985 Chick wing bud motor axons chimaeras reversal innervation Axons normally connect with their targets in a predictable and spatially ordered way. One way of testing whether active guidance mechanisms are involved...