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Fig. 3. Co-immunostaining of CDK7 and XPD during early fly embryogenesis from syncytial blastoderm to gastrulation. (a) XPD (green signal) is preferentially nuclear after mitosis number 10. CDK7 (red signal) is preferentially located in the cytoplasm at these developmental stages. (b) Amplification of a cellular blastoderm co-stained with CDK7 (red) and XPD (green). (c) Amplification of a gastrulated embryo co-stained with CDK7 (red) and XPD (green).