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Fig. 6. Impaired growth-plate angiogenesis in Bmpr1aCKO
mice. (A) H/E-stained sections from E16.5 distal femurs. (B)
Adjacent sections immunostained for PECAM. In wild-type mice, blood vessels
are restricted to the chondro-osseous junction (boxed area in B), where
apoptotic chondrocytes are located. In Bmpr1aCKO mutants,
blood vessels can be seen invading the region of the growth plate occupied by
late hypertrophic chondrocytes.