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Fig. 4. Xist is stably repressed in the absence of spliced
Tsix RNA. Transcriptional activity of the Xist locus was
analyzed by RT-PCR using RNA isolated from E13.5 male and female embryos
carrying the respective mutation. Diagrams show the structure of each mutant
allele and positions of primers used for PCR. Transcription of the
Xist locus on the mutated X was examined using a primer set specific
for EGFP.