The majority of GFP+ cells are ENS neurons at later stages of ENS development. At 5 (A?A?) and 7 (B?B?) days post fertilization (dpf) GFP+ ENS neurons (white) are found along the whole length of the gut. A smaller fraction are GFP+ non-neuronal cells (green) or GFP? ENS neurons (magenta). Insets in (A?,B?) show the close-up of the boxed area, GFP, Elavl, and overlay from left to right. Schematic of boxed area of larval schematic (C) indicates the four gut sub-regions analyzed (D). Quantification of GFP and Elavl colocalization at 5 dpf (E) and 7 dpf (F) in four gut regions shown in (D). Bar graph shows % GFP+/Elavl+ out of total number of cells quantified [GFP+/Elavl+, GFP+/Elavl?, and GFP?/Elavl+], (yellow), % GFP+/Elavl? out of total cells (green), and % GFP?/Elavl+ out of total cells (magenta). Using 2-way ANOVA, we did not find significant differences between the cell populations of the different gut regions except where indicated (** p ? 0.01). Error bars show ±standard error of the mean (5 dpf: 2 experiments, 19 larvae; 7 dpf: 2 experiments, 15 larvae). (A?A?,B?B?): maximum projections of dissected guts at stage indicated. Scale bar = 100 µm.
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