a comparison of the ultrastructural features and the distribution of labelled cells , their topographic interrelations at different times following the isotope injection suggests that during histogenesis in the endochondral centres the little-differentiated perivascular cells become spatially separated and are involved in the formation of the stromal cellular elements ( in particular , fibroblasts , reticular cells , osteoblasts ) .
C0178679
histogenesis
C0007589
differentiated