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Fig. 5. Presence of stem/progenitor cells in cultures of E12 blood. (A) Osteogenic
cell differentiation after 10 days of treatment in osteogenic permissive
medium. Colonies stained positive for ALP. (B) Adipogenic differentiation
after stimulation with adipogenic-inductive medium for 10 days; adipocytes are
shown. (C) Chondrogenic differentiation after 21 days in chondrogenic medium.
E12 blood cells formed a small cartilage-like pellet, in which the
extracellular matrix was rich in proteoglycans, as detected by Toluidine Blue
staining.