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Cells of the ejaculatory duct stained with antibodies against Drosophila coilin (green) and Drosophila Lsm11 (red). DNA is stained with DAPI (blue). (A) In flies heterozygous for coil199 and the balancer CyO, a single coilin-positive Cajal body and a single Lsm11-positive histone locus body are detectable in each nucleus. (B) In the homozygous coil199 fly, coilin is absent and only the histone locus body is detectable.
