IGF-2a and IGF-2b are required for the development of anterior neural structures during zebrafish gastrulation and play anti-apoptotic roles during segmentation. (A, B) Knockdown of igf-2a or igf-2b results in a reduction of pax6.2 expression in the developing eye and midline region. (C, D) Knockdown of igf-2a or igf-2b causes a reduction of rx3 expression. (E) Knockdown of igf-2a results in an increase in apoptosis, particularly in the developing spinal cord. (F) Knockdown of igf-2b results in an increase in apoptosis, particularly in the anterior region of the embryo. Frequency of embryos displaying this staining pattern; A, 14/32; B, 8/20; C, 15/39; D, 14/33; E, 17/30; F, 12/33. A-D are views of the future anterior region and E, F are lateral views.
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