Darwin- would he have changed his theory?

You mean, thinking? Apparently not.

What would make them?

Take them from what? And when the organism wants to reproduce, where do those new proteins come from?You don't seem to get it, yet. It's not a matter of Shake and Bake proteins, not the least of which is because organisms are made out of more than protein.Also, there's potentially a billion billion protiens. So, exactly which ones to you suggest we use?

Proteins don't really "combine."See, its statements like these that betray your staggering ignorance of the fundamentals of biology. Biologists don't just make shit up, SP. Why do you think you can?Take a class, for god's sake, if you want to talk about this subject.

Indeed. I understand mitochondria have a slightly different code, which substantiates endosymbiosis as the explanation of their origin.But the fact that the standard code is shared by almost every organism is a pretty powerful argument for common descent.

Ok, you can turn down the pedantism, a bit. I never said it was just mitochondria, and I never said that every single organism uses the Standard Code. I understand a need to be precise, or to prevent misunderstanding, but you seem to be taking a fairly strident tone against assertions I'm not making.