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A–C. Phospho-Histone H3 staining of the frontoparietal bone. A. Stage 52, B. 56, and C. 60, 40× magnification. There is positive staining in the lateral aspects of the frontoparietal bone and surrounding cartilages at Stages 52 and 56 (white arrow heads); no staining is observed at Stage 60 once the frontoparietal bone has completely ossified.
