How to tell a cell where it is.
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D000818:Animals; D004058:Diffusion; D004330:Drosophila; D029721:Drosophila Proteins; D004625:Embryo, Nonmammalian / Q000166:cytology* / Q000502:physiology; D004627:Embryonic Induction; D018507:Gene Expression Regulation, Developmental; D007301:Insect Hormones / Q000502:physiology; D008954:Models, Biological; D009024:Morphogenesis / Q000502:physiology; D009154:Mutation; D015398:Signal Transduction; D014921:Wings, Animal / Q000196:embryology
D029721:Drosophila Proteins; D007301:Insect Hormones; C064196:dpp protein, Drosophila