PROBLEM TO BE SOLVED: To provide activin A containing a cleavage sequence of a protease which is cheaper than Furin. Activin A comprising a modified protease cleavage sequence. [Selection diagram] None【課題】Furinと比較して安価なプロテアーゼの切断配列を含むアクチビンAの提供。【解決手段】改変されたプロテアーゼ切断配列を含むアクチビンA。【選択図】なし