Fig. 5. Defects in hypertrophic differentiation in Bmpr1aCKO
mice. (A) E14.5 and (B) E16.5 distal femoral growth plates
immunostained for markers of hypertrophic differentiation. In B, the length of
the hypertrophic zone is demarcated by a black bar. The region of marker
expression is demarcated by blue double-headed arrows. There is an increase in
the overall length of the hypertrophic zone and a disproportionately enlarged
zone of late hypertrophic chondrocytes in mutants at E16.5.