Why might transferring cultured C2C12 cells into a differentiation medium (DM) containing a reduced?

... amount (2%) of fetal bovine serum (FBS) trigger differentiation? or:... amount (2%) of fetal bovine serum (FBS) trigger differentiation?

... amount (2%) of fetal bovine serum (FBS) trigger differentiation?

or:... amount (2%) of fetal bovine serum (FBS) trigger differentiation?

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