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Fig. 1 Somatotopic ganglion organization in the posterior lateral line (PLL) ganglion of a zebrafish embryo. A-H: Confocal images of the PLL ganglion of 6 days postfertilization (dpf; A-D) and 54 hours postfertilization (hpf; E-H) Tol 047 embryos that had been retrogradely labeled from different inter-neuromast regions; between the fourth (described as "L4" on the top row) and fifth (L5) PLL neuromast (A, E), third (L3) and fourth (L4) neuromast (B, F), second (L2) and third (L3) neuromast (C, G), and first (L1) and second (L2) neuromast (D, H). In some cases, exceptional cells were observed (white arrows). I: Quantification of somatotopic map precision at 54 hpf, 6 dpf, and 7 dpf. The number of total labeled cells and exceptional cells were counted and the proportion of exceptional cells was thus calculated. Sample numbers are shown in each column. Error bars are the SEM. **P < 0.05, *P < 0.2 (student′s t-test corrected for multiple comparisons). Scale bars = 10 μm.