Fig. 5. Phenotype of MMP13fl/fl;Col2-Cre+/ endochondral bones.
(A,B) Safranin-O stained metatarsals from 2-week-old wild-type and
MMP13fl/fl;Col2-Cre+/ mice show an increased hypertrophic
chondrocyte (HC) zone in MMP13fl/fl;Col2-Cre+/ mice similar
to that observed in Mmp13/ mice (compare
with Fig. 1D,E). (C,D)
Picrosirius red-stained femurs from 10-week-old wild-type and
MMP13fl/fl;Col2-Cre+/.
MMP13fl/fl;Col2-Cre+/ mice lack the increased trabecular
bone (TB) phenotype observed in the Mmp13/
mice, but have an altered structure of the trabeculae (arrow). SO, secondary
site of ossification. Scale bars: 100 µm in A,B; 300 µm in C,D.