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Fig. 7 Developmental series of zebrafish palatoquadrate ossification.Flat-mounted views of larval zebrafish palatoquadrates. Anterior is to the left. For description, see text. SL, standard length of the fish (in mm). A-D: 6 mm SL. E-H: 10 mm SL. I-L: 12 mm SL. M-P: 16 mm SL. Stained specimens were cleared in 50% glycerol, flattened under a coverslip, and imaged with Nomarski optics. The images in the second and fourth columns (40x) are optical magnifications of the specimens in the first and third columns (20x). All images in a column are shown at the same magnification. Abbreviations are as in Figure 5. Arrowheads point to the arcs of elongated chondrocytes. All scale bars = 100 μm.