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A: The interaction of 
and 
in determining myeloid cell or erythroid cell, 
and 
in determining inner cell mass or trophectoderm, 
and 
in determining epiblast or primitive endoderm. B: Scheme for the gene circuit of B cell to macrophage conversion. The dashed lines indicate uncertainty. C: Scheme for the gene circuit in determining mesendodermal and ectodermal.
