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Development, Vol 107, Issue 4 863-867, Copyright © 1989 by Company of Biologists

JOURNAL ARTICLES

Retinoic acid induces a pattern of digits in anterior half wing buds that lack the zone of polarizing activity

G Eichele
Department of Cellular and Molecular Physiology, Harvard Medical School, Boston, MA 02115.

Wing buds whose posterior half is excised, develop into wings lacking distal structures. However, such experimentally generated preaxial half wing buds can be rescued by implanting a retinoic-acid-releasing bead at their anterior margin. The polarity of the pattern that originates from preaxial half wing buds is reversed. For example, instead of a 234 digit pattern typical for normal wings, the order of digits is 432. This result implies that retinoic acid has the capacity to reprogram anterior limb bud tissue, and that the resulting change in cell fate does not depend on the presence of posterior tissue regions such as the zone of polarizing activity (ZPA).
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© The Company of Biologists Ltd 1989