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Genetic analyses of Drosophila oogenesis have revealed the central role of ovo, a gene required for differentiation of the female germline. A number of recessive ovo mutations also affect the shavenbaby (svb) function required for late embryo patterning, sugesting a tight structural link between ovo and svb. By using various genomic probes for in situ hybridization to wild type and mutant embryos,...