Why does the target protein level with siRNA-knockdown (on day 0) is reduced at day 2, rises back to control level at day 3 and drops again at day 4?

I performed a siRNA knockdown in vitro experiment. Target gene protein expression was decreased at 2 days after knockdown, however, it went back to normal level in compare with vehicle and ssRNA...

09 January 2015 9,837 3 View