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Fig. 4. Cux2 and RORbeta staining in wild-type animals and
ApoER2 mutants at P7. (A,E) In situ hybridization
for RORbeta, a marker of layer IV neurons, showed strong expression
in layer IV in sections of wild-type animals (arrow in A). In ApoER2
mutants (E), strongest RORbeta expression was found in superficial
portions of the cortex underneath the marginal zone and close to the ventricle
(arrows). (B-D,F-H) Double fluorescence in situ hybridization
for Cux2 (green) and RORbeta (red) revealed that
Cux2 labels mainly layer II-III neurons and only a superficially
located subpopulation of layer IV in wild-type animals (B-D). Arrowheads in D
point to double-labeled cells. In ApoER2 mutants (F-H),
Cux2- and RORbeta-labeled neurons were scattered throughout
the cortex with cell accumulations underneath the marginal zone and close to
the ventricle (arrows). Arrowheads in H point to double-labeled cells. Scale
bars: 200 µm.