Active Transport, Cell Nucleus|Animals|Animals, Genetically Modified|Biophysical Phenomena|Body Patterning|Computational Biology|Computer Simulation|Diffusion|Drosophila Proteins|Drosophila melanogaster|Fluorescence Recovery After Photobleaching|Homeodomain Proteins|Models, Biological|Recombinant Fusion Proteins|Spectrometry, Fluorescence|Trans-Activators