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Identification of serum peptides present at higher levels in PTC patients. Sequencing of select serum peptides was achieved with LTQ-Orbitrap-MS/MS. (A) Peak m/z 2671.17 (sequence: K.SYKMADEAGSEADHEGTHSTKRGHA.K) was identified as a fragment of fibrinogen alpha chain with an ion score of 196. (B) Peak m/z 1738.92 (sequence: R.NGFKSHALQLNNRQI.R) was identified as a fragment of Complement C4B with an ion score of 64.
