Table 2. Characteristics of identified plasma peptide in the participants.

Peak	Amino acid sequence	Peak identity	Total (n=1890)
m/z 2044.75	K.VFDEFKPLVEEPQNLIK.Q	Albumin	105.3 (40.0-160.1)
m/z 2065.31	D.APRIKKIVQKKLAGDESAD.-	Pro-Platelet basic protein	35.3 (14.2-75.1)
m/z 2487.01	S.NSRDDGNSVFPAKASATGAGPAAAEK.R	Hyperpolarization-activated cyclic nucleotide-gated potassium channel 1	26.1 (16.7-42.1)
m/z 3428.10	K.YWSQQIEESTTVVTTQSAEVGAAETTLTELR.R	Keratin 18	60.4 (24.3-113.5)
m/z 2883.99	L.LPVLESFKVSFLSALEEYTKKLNTQ.-	Apolipoprotein A-I	36.4 (19.5-59.2)
m/z 1076.14	E.GDFLAEGGGVR.G	Fibrinogen alpha chain	30.2 (20.6-41.8)
m/z 3060.13	K.SSSYSKQ(+.98)FTSSTSYNRGDSTFESKSYK.M	Fibrinogen alpha chain	73.6 (33.3-135.6)
m/z 1120.39	T.HRIHWESAS.L	Complement C3	18.5 (13.1-25.7)
m/z 2190.59	G.SPMYSIITPNILRLESEET.M	Complement C3	45.7 (26.2-80.4)
m/z 1052.53	K.SHALQLNNR.Q	Complement C4-A	20.6 (13.7-29.9)
m/z 1898.21	S.STGRNGFKSHALQLNNR.Q	Complement C4-A	24.3 (14.8-56.8)
m/z 1607.84	P.KC(+57.02)KEMQNSLN(+.98)NDK.N	Breast cancer type 2 susceptibility protein	19.0 (9.97-38.8)
m/z 2211.86	V.YRLPPLRKGEVLPLPEAN(+.98)F.P	Histidine-rich glycoprotein	38.1 (20.0-80.8)

Data were presented as median together with interquartile range. Peptide content in human plasma is measured in intensity.