carbon content of proteins?

[Jonathan Walton]

Can anyone tell me a generally accepted average value for the % (by
weight) of carbon in proteins?  The value of 15-16% for N is generally
used, but how about carbon?  And (related question that would give the
answer) is there is a program that will calculate the elemental
composition of a protein?
Thanks,

Jon Walton
Michigan State Univ.
walton at pilot.msu.edu