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Fig. 2. Ectopic generation of 5-HT neurons by Gata2 in r1. (A,B) Whole-mount immunofluorescence of chick hindbrain 4 days after electroporation of Gata2, with antibodies against 5-HT (red, A,B) and 3C2, a viral envelope marker (B, green). Endogenous 5-HT neurons (en.) versus ectopic 5-HT neurons (ect.) are bracketed (A). An arrowhead indicates the lack of 5-HT neurons in the midbrain (MB) despite the presence of exogenous Gata2 (B, green). The midbrain (MB) and mid-hindbrain boundary (MHB, arrow) are marked. (C) Immunofluorescence for 5-HT on thin (10-12 µm) sections through r1 of the hindbrain. The dorsal roof plate (rp) and ventral floor plate (fp) are marked; endogenous 5-HT neurons (en. 5-HT) versus ectopic 5-HT neurons (ect. 5-HT), and unelectroporated side (control side) are marked by brackets. (D-G) Higher magnification of ectopic 5-HT positive neurons (red; D,E,G) from C, showing cell bodies and processes (D, arrows) and co-localization (E-G, arrows) with 3C2 (F,G, green). Scale bars: C, 75 µm; D, 12.5 µm; G, 8 µm.





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