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Fig. 7. A model for the role of apoptosis in Xenopus neurodevelopment. (A) Mesoderm patterning in wild-type (left panel) or embryos in which apoptosis has been inhibited through BCL2 or Xbarhl2AS injection (right panel). Chordin expression is in dark blue. Xvent2 expression is in light yellow. The neuroectoderm is in blue. The apoptotic area is shown in black. (B) Neuroectodermal patterning in similarly injected embryos. Xshh expression is in red. Gli1 expression is in bright yellow. Gli3 expression is in violet. Xsox3 expression is in blue.