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**. 500. 400. *. *. ActRI mRNA levels (% of Control). 300. 200. 100. 0. control. 1 h. 3 h. 6 h. 12 h. 24 h. Duration of activin-A treatment.
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** 500 400 * * ActRI mRNA levels (% of Control) 300 200 100 0 control 1 h 3 h 6 h 12 h 24 h Duration of activin-A treatment