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Fig. 6. Analysis of the primary spongiosa in chimeric embryos.
Smon/n cells fail to contribute to the primary
spongiosa in chimeric embryos (A,B) whereas
Smon/+ cells contribute extensively (C).
Longitudinal sections of the tibia at E17.5 are stained with H&E.
Smon/n or Smon/+
cells are stained blue as a result of the expression of ß-galactosidase.
The boxed region in A is shown at a higher magnification in B. Asterisks
denote the blood vessels. Arrows in B point to occasional
Smon/n cells in the marrow cavity.