Originally posted by twhitehead
I don't know for sure, but I think that there are many copies of these molecules, so its not a case of a single molecule looking for a single gene.
I would think that would require a lot of such signal molecules for that to work! the signal molecules would have to be all throughout the nucleus just to guarantee one of them just happens to blunder into the one tiny miniscule spot were the gene is.
If that is the way it works, then it strikes me that evolution has made it very inefficient.