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The DDK strain (Mus musculus domesticus) of inbred mouse has a unique peculiarity known as DDK syndrome. The DDK females are mostly infertile when crossed with males of other inbred strains, while DDK males exhibit normal fertility in the reciprocal crosses, as intrastrain matings. This DDK syndrome has been demonstrated to be caused by an incompatibility system between DDK ooplasmic factor and the...
The DDK syndrome is known as the polar-lethal embryonic death that occurs at the morula-blastocyst stage when female mice of the DDK strain are mated with males from many other inbred strains (alien males). Embryonic death is interpreted to be caused by incompatibility between a DDK oocyte factor and the product from male pronucleus, both of which map to the Om locus on mouse chromosome 11. We compared...
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