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Expression of the 5-HT3A receptor. (A–C) Drawings shown in Figure 2 have been modified in order to depict the expression of 5-HT3A (green) during development. Note that 5-HT3A is expressed by pioneer Cajal-Retzius cells of the marginal zone (MZ; A, E12) and by a subpopulation of late generated GABAergic neurons arising from the CGE (E14 and E16–E17). (A′–C′) Corresponding photomicrographes of the drawings presented in (A–C). Scale bar: (A) 20 μm; (B) 100 μm; (C) 120 μm.
