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Fig. 6. Cux2 overexpression. (A-C) P27Kip1 levels (red) in
E11.5 wild-type (A) and Nestin-enhancer-driven Cux2-ires-EGFP (green)
transgenic (B-C) spinal cords in which Cux2 enhances p27Kip1 in the
vz and iz in a cell-autonomous manner (*). (D-F) NeuN
immunohistochemistry on E11.5 control (D) and Cux2 transgenic (E,F)
ventral spinal cords revealed that Cux2 increases NeuN-labeled post-mitotic
neurons emerging from the vz (arrow). (G-I) Neurofilament
immunohistochemistry labels axons growing towards the ventral midline in
control embryos; however, in Cux2-ires-EGFP transgenic embryos, Cux2
overexpression induced ectopic disorganized and misdirected axons throughout
the mz (*). (J,K) TuJ1 staining of HH stage 14-15
chick embryos electroporated with a murine Cux2-ires-EGFP vector.
(L) Quantification of TuJ1+ and GFP+ double-positive cells following
control vector or Cux2 overexpression. *P=0.05 by
Student's t-test. Scale bars: 250 µm in A; 300 µm in G.