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Fluorescence photomicrographs of sections of calvariae from 4-week-old wild-type and Col1a1r/r mice stained by the TUNEL method. (a) Presence of TUNEL-positive cells in calvariae from wild-type and Col1a1r/r mice. Open bars indicate outer (top) and inner (bottom) surfaces of the periosteum. (b) Quantification of TUNEL-positive cells in calvariae from wild-type and Col1a1r/r mice.
