..., in concert with the HOM-C proteins,promotes the specification of individual segment identity. To obtain flies expressing Dfd in the trunk segments of embryos lacking disco and disco-r , we crossed Df(1)XR14 / FM7c females to UAS- Dfd (II) homozygous males. The non- FM7c female progeny were crossed...

... in the T3 limb primordium. The regulation of one downstream target of UBX, the Distalless gene, provides a model for this transition at the molecular level. * Author for correspondence 30 05 1995 © 1995 by Company of Biologists 1995 Ultrabithorax Bithorax complex segment identity...

... ‘transposition’ is used to describe this phenomenon. Genetic experiments with homeotic genes in mice have demonstrated that Hox genes are in part responsible for the specification of segmental identity along the anterior-posterior axis, and it has been proposed that an axial Hox code determines the morphology...

... † Present address: Swiss Institute for Experimental Cancer Research, CH-1066 Epalinges, Switzerland 08 April 1994 © 1994 by Company of Biologists 1994 leech HOM/Hox gene axis formation segment identity cell lineage positional information neuronal differentiation The HOM...

... of Biologists 1993 Abdominal-B homeotic gene segment identity short-germ insect orthoptera The bodies of arthropods are composed of a reiterated unit, the segment. These segments, whilst sharing a common plan, may be modified to varying degrees to produce their unique specialisations...

... suggested that each stem cell lineage establishes at least some aspects of its own segmental specificity autonomously. In this paper, we describe a putative leech segment identity gene, Lox2 , and exam-ine its expression in the various stem cell lineages. Both sequence analysis and the segmental pattern...

.... The genotype deficient for the distal part of the complex shows normal function for Ubx and abd-A but has a phenotype typical for severe Abd-B mutations. Conversely, the distal fragment retains a segment identity function which must represent a contribution from Abd-B in parasegments 13 and 14; the latter...