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Fig. 3. Proliferation in the QJ at e14, as shown by the percentage of S-phase cells after BrdU labelling for 90 minutes at 0 hours. Figure (inset) indicates regions of the QJ counted for each value. Values shown are mean±s.d. from three QJs, a total of 6 sections. Asterisk indicates a significant difference between the periosteum and the germinal region (P<0.001, Student's t-test).