Heavy Isotope Labeled PTMs

[pmt706]

Throughout PSI-MOD, when a heavy labelled atom is added in place of a "regular" atom, it's listed as

(12)C -X (13)C X , where X is the number of atoms being replaced.

Technically this is wrong, it should be

C -X (13)C X , where X is the number of atoms being replaced.

The issue is that the atom being replaced isn't "pure carbon 12" (100% 12C), but rather "natural carbon" (98.9%12C, 1.1%13C) This won't have any effect on the DiffMono's, but will on the DiffAvg's and thus should be done... thoughts?

[edeutsch]

This seems convincing to me.