Fig. 5. Activity of a single isolated NFY/YY1 binding element. (A-C) Lateral views of three transient F₀ transgenic 12 dpc embryos stained for ß-galactosidase activity showing the expression patterns derived with the b4C-511-558-mYY1 construct. A schematic diagram of the construct is shown on the right. Consistent staining can be seen within the neural tube, cranial (black arrows in A and B) and spinal ganglia (white arrows in A and C).