Table 2.

Citrullinated inter-alpha-trypsin inhibitor heavy chain 4 was identified in human samples by two-dimensional PAGE and nanoUPLC-MS^E

Protein ID	Protein name	Coverage (%)		MW (kDa)
		HS	RA
B7Z545	Inter-alpha-trypsin inhibitor heavy chain 4	40.0	–	99.7
B2RMS9	Inter-alpha-trypsin inhibitor heavy chain 4 (inter-alpha globulin inhibitor H4)	–	42.3	103.3
Position	Peptide sequence	Calculated mass	Observed mass	Arginine
429–438	LALDNGGLA(cit)	999.55	999.53	R438

Abbreviations: HS Healthy subjects, MW Molecular weight, RA Rheumatoid arthritis

Calculated mass = calculated mass-to-charge ratio of the modified peptides; observed mass = observed mass-to-charge ratio of the modified peptides