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The DDK syndrome is defined as the embryonic lethality of F1 mouse embryos from crosses between DDK females and males from other strains (named hereafter as non-DDK strains). Genetically controlled by the Ovum mutant (Om) locus, it is due to a deleterious interaction between a maternal factor present in DDK oocytes and the non-DDK paternal pronucleus. Therefore, the DDK syndrome constitutes a unique...
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