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Fig. 3. Hypoxia influences the kinetics of mesoderm differentiation. Flow cytometry
was performed on dissociated cells obtained from EBs harvested at the
indicated time points. (A) The number of FLK1+ cells detected in
differentiated Arnt+/+ EBs is increased by hypoxic
conditions. In direct contrast, the number of FLK1+ cells in two
independent Arnt/ cell lines is reduced in
normoxia and is not enhanced by 3% O2. (B) Hypoxia stimulates the
production of GFP+ cells in GFP-BRY ES cells as early as day 2 of
differentiation.