Relative repression of luciferase expression standardised to a transfection control. The following reporter constructs were tested: (A) BCL-2 reporter constructs carrying a single binding site for miR-16, (B) BCL-2 reporter construct carrying a triple binding site for miR-16, (C) c-MYC reporter constructs carrying a single binding site for let-7, (D) c-MYC reporter constructs including sensors carrying the whole 3'UTRs from the c-MYC gene. The luciferase activity was normalised against β-gal expression. Results are presented in % (100% – luciferase vector with no binding site, (+) control). Average from several experiments is shown (details in the text).