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A polyclonal antibody to abdA protein stains embryonic nuclei in segments A1-A7 (parasegments 7-13). The iab-2, 3, and 4 mutant classes define positive cis-regulatory elements that induce expression of abdA in segments A2-A4 (parasegments 7-9), respectively. Once a pattern of abdA expression is turned on in a given parasegment, it remains on in the more posterior parasegments, so that the complex pattern of expression is built up in the successive parasegments. The abdA product appears to repress expression of Ubx whenever they appear in the same cell, but abdA is repressed by AbdB only in the eighth and ninth abdominal segments.<\/jats:p>","DOI":"10.1101\/gad.4.9.1573","type":"journal-article","created":{"date-parts":[[2007,6,5]],"date-time":"2007-06-05T21:15:46Z","timestamp":1181078146000},"page":"1573-1587","source":"Crossref","is-referenced-by-count":185,"title":["abdA expression in Drosophila embryos."],"prefix":"10.1101","volume":"4","author":[{"given":"F","family":"Karch","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"W","family":"Bender","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"B","family":"Weiffenbach","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"246","published-online":{"date-parts":[[1990,9,1]]},"reference":[{"key":"2021111320091333000_4.9.1573.1","doi-asserted-by":"crossref","first-page":"1689","DOI":"10.1002\/j.1460-2075.1985.tb03838.x","article-title":"The distribution of Ultrabithorax transcripts in Drosophila embryos.","volume":"4","year":"1985","journal-title":"EMBO J."},{"key":"2021111320091333000_4.9.1573.2","doi-asserted-by":"crossref","first-page":"123","DOI":"10.1242\/dev.104.Supplement.123","article-title":"Homeotic genes and the control of segment 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