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Development, Vol 111, Issue 2 437-449, Copyright © 1991 by Company of Biologists
JOURNAL ARTICLES |
E Sanchez-Herrero
Centro de Biologia Molecular, Facultad de Ciencias, Universidad Autonoma de Madrid, Spain.
The abdominal-A (abd-A) and Abdominal-B (Abd-B) genes of the bithorax complex (BX-C) specify the identity of most of the Drosophila abdomen. Six different classes of infraabdominal (iab) mutations within the BX-C transform a subset of the parasegments affected by the lack of these two genes. It is thought that these mutations define parasegmental cis-regulatory regions that control the expression of abd-A and Abd-B. By staining embryos mutant for different iab mutations with anti-abd-A and anti-Abd-B antibodies I show here that the expression of Abd-B (and probably also abd-A) exhibit a parasegmental regulation. I have also studied the significance of the chromosomal order of parasegmental iab regulatory sequences, and the possible presence of chromosomal 'boundaries' between them, by looking at the expression of abd-A and Abd-B in embryos carrying the Uab and Mcp mutations. These data are discussed in the light of models of parasegmental-specific regulatory regions within the BX-C.
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