When meat shrinks from cooking, has its protein content been altered?

[#8]

I like to cook sirloin angus burgers often because of their high protein content and good taste. They shrink slightly during cooking because of fat seeping out on the grill and other moisture (I assume).

Because the burgers are now slightly smaller, do they still contain the same protein content or is that altered as well?

[Praetorian]

You lose fat and water when cooking...not much protein in that.
P

[Reaver.]

All fat and water! :P