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Fig. 2. Robo1 and Robo2 expression in the forebrain. Robo1 and Robo2
expression was examined using antibodies specific for each receptor.
(A-D) In rostral sections, Robo1 protein was highly expressed on
callosal axons at E17 (A, coronal view; arrow in C; C is a higher power view
of A), whereas Robo2 staining is very faint (B, coronal view at E17; arrow in
D; D is a higher power view of B). (E,F) In more caudal regions,
Robo1 is expressed on the hippocampal commissure (HC) and on the corpus
callosum (CC) (E, horizontal view at E17); Robo2 is expressed on the
nigrostriatal pathway (NSP), the internal capsule (IC) and the optic tract
(OT) (F, coronal view at E17). Scale bar in A: 200 µm for A,B,E,F; in C,
100 µm for C,D.