Fig. 3.

DiI labeling of olfactory sensory neurons in a tau-EGFP transgenic zebrafish embryo at 84 hpf. Anterior-view images of a confocal section through the olfactory organ are shown. Tau-EGFP-expressing cells were visualized with an argon laser (left), and DiI-labeled cells were monitored with a helium–neon laser (middle). These images are merged on the right. An iris of the confocal microscopy was set to obtain fluorescent signals from the confocal plane with ∼4 μm width. OB, Olfactory bulb; OP, olfactory placode. Scale bar, 10 μm.