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BACKGROUND Abundant availability of homeotic mutants in Bombyx mori provides us with clues to study the body plan of the silkworm. Previous studies indicated that the ECa/ECa and EN/EN embryos, which reveal drastic morphological changes (Itikawa 1943, 1952) lack the homologue of abd-A and the homologues of abd-A and Ubx, respectively (Ueno et al. 1992). It(More)
A cDNA clone encoding a small GTP binding protein (Brho) was isolated from an embryonic cDNA library of Bombyx mori that encoded a polypeptide with 202 amino acids sharing 60-80% similarity with the Rho1 family of GTP binding proteins. The effector site and one of the guanine nucleotide binding sites differed from other members of the Rho family. To(More)
In silkworms, sex-limited strains are either obtained spontaneously or induced by X-rays or gamma rays. When a fragment of an autosome carrying a dominant allele of those genes responsible for certain characters is translocated onto a W chromosome, the female of the successive generations will express these phenotypic characters and sex discrimination can(More)
Bombyx mori densovirus type 2 (BmDNV-2), a parvo-like virus, replicates only in midgut columnar cells and causes fatal disease. The resistance expressed in some silkworm strains against the virus is determined by a single gene, nsd-2, which is characterized as nonsusceptibility irrespective of the viral dose. However, the responsible gene has been unknown.(More)
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