(B) Relative luciferase activity of the let-7 sensor reporter (sensor (+)) or the negative control sensor (-) reporter contransfected with pLX-Lin28A in HEK293FT cells with or without pcDNA-pri-let-7a transfection. Error bars show SD; n=3. Significance was assessed using 2‐tailed Student's t‐test, < 0.05*. 