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- W2029540073 abstract "We have devised an in vitro bioassay for limb bud polarizing activity in the chick embryo. This assay has proven to be a relatively quick and effective test for a morphogenetic factor asymmetrically distributed in the limb bud which is capable of maintaining or thickening the apical ectodermal ridge. A small section of the preaxial border of the chick embryo wing bud was cultured alone, with tissue from the posterior border, mid-dorsal or anterior corner of a second donor wing, or from the flank. The tissue from the preaxial border (responding tissue) consisted of mesoderm with overlying ectoderm and apical ectodermal ridge. When the responding tissue was cultured alone, with flank, or with anterior corner limb tissue, the apical ectodermal ridge flattened in 24–36 hr and many macrophages appeared in the underlying mesoderm. When cultured with posterior border limb tissue however, the apical ridge of the responding tissue remained thickened for up to 48 hr., and no macrophages appear in the underlying mesoderm. The behavior of responding tissue was intermediate between these two extremes when cultured with mid-dorsal limb tissue. The morphogenetic activity assayed by this procedure thus seems to be present as a gradient in the wing bud, with activity decreasing from posterior to anterior. Contact with the responding tissue is not required to enable posterior border tissue to elicit ridge thickening and inhibit the cell death." @default.
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- W2029540073 date "1975-08-01" @default.
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- W2029540073 title "The in vitro maintenance of the apical ectodermal ridge of the chick embryo wing bud: An assay for polarizing activity" @default.
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- W2029540073 doi "https://doi.org/10.1016/0012-1606(75)90072-x" @default.
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