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Fig. 6. Analysis of cell death in the Fgf8 mutants at E9.0. TUNEL
analysis on horizontal sections through the E9.0 forebrain labels apoptotic
cells in wild-type (A-E), Fgf8Null/Neo
(A'-E') and Fgf8TelKO embryos
(A''-E''). A-A'' are the most ventral; E-E'' are
the most dorsal. Note, sections B,B',B'' are the same as in
Fig. 5. Black arrowheads
indicate the rostral midline; white arrowheads indicate the apoptotic cells in
the telencephalic primordium (A',B',B'',C'') and at the
junction of the dorsal optic stalk with the telencephalon
(D',D'',E',E''). HT, hypothalamus; Os, optic stalk; Tel,
telencephalon.