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Expression level of each fusion protein by the three points method. (A1–A3) GST-GS16F1; (B1–B3) GST-GS16F4; and (C1–C3) GST-GS16F8. A1–C1: different IPTG concentration (mM); A2–C2: different induce time (h); and A3–C3: different initial cell density.
