Peptide sequence tag

Thus, a tandem mass spectrum contains partial information about the amino acid sequence of the peptide.

Briefly, a couple of masses are extracted from the spectrum in order to obtain the peptide sequence tag.

A notation has been developed for indicating peptide fragments that arise from a tandem mass spectrum.

The subscript indicates the number of amino acid residues in the fragment.

Prime symbols indicate the number of protons or hydrogens added to the fragment to form the observed ion.