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The olfactory pioneer neurons die. Preparation labeled for zns-2 (green) and TUNEL (magenta) at 42 h shows pioneer neurons dying at this time. The TUNEL-labeled cells are primarily located in the basal-medial part (arrowhead) of the olfactory organ.o, Olfactory organ; ob, olfactory bulb;double cross indicates the location of the unlabeled sensory neurons. Ventral-oblique view. Serial optical sections from the olfactory organ into the bulb were superimposed. Scale bar, 20 μm.
