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Fig. 1
Establishment of the joint initiation time line. Fins were amputated at the 30% level and permitted to regenerate for 2–5 days before processing for ZNS5 immunofluorescence. Selected time points are shown. Fins at 87 hpa frequently exhibited “initiating” joints in the third fin ray from the dorsal or ventral side. The ratios in each image indicate the frequency of initiating joints at each time point. Arrowheads indicate the organizing joint-forming cells, and the asterisks in 96 hpa identify the separating rows of joint-forming cells. Scale bar = 20 µm.
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