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Figure Caption
Fig. 1 A-D: Cleared and cartilage-stained skeletal preparations showing the progression of segmentation in zebrafish anal fin radials (A-C; adapted from Bird and Mabee,[2003]) and an 18 days postfertilization mouse embryo (D). A: 5.4 mm. B: 5.6 mm. C: 6.5 mm, proximal and distal radials are identified; asterisks mark the zones of segmentation. D: The mouse left forehand is shown here in a dorsal view with anterior at bottom. Two joints in digit four are marked with asterisks. Scale bars = 0.5 mm.
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