Table 3 Major proteins detected in the ASL and their exclusive spectrum counts.

	Identified proteins	Accession number	Alternate ID	Molecular weight	Exclusive spectrum count
1	Pulmonary surfactant-associated protein B	P07988	SFTPB	42 kDa	192
2	Complement C3	P01024	C3	187 kDa	163
3	Fibronectin	P02751	FN1	272 kDa	132
4	Complement factor H	P08603	CFH	139 kDa	131
5	Basement membrane-specific heparan sulfate proteoglycan core protein	P98160	HSPG2	469 kDa	88
6	Complement factor I	P05156	CFI	66 kDa	77
7	EGF-containing fibulin-like extracellular matrix protein 1	Q12805	EFEMP1	55 kDa	77
8	Cluster of Actin, cytoplasmic 1	P60709	ACTB	42 kDa	76
9	Polymeric immunoglobulin receptor	P01833	PIGR	83 kDa	76
10	Apolipoprotein E	P02649	APOE	36 kDa	70
11	Alpha-1-antitrypsin	P01009	SERPINA1	47 kDa	67
12	Carboxypeptidase M	P14384	CPM	51 kDa	67
13	Pro-cathepsin H	P09668	CTSH	37 kDa	67
14	Keratin, type II cytoskeletal 8	P05787	KRT8	54 kDa	55
15	Sulfhydryl oxidase 1	O00391	QSOX1	83 kDa	58
16	Ceruloplasmin	P00450	CP	122 kDa	57
17	Acid ceramidase	Q13510	ASAH1	45 kDa	55
18	NPC intracellular cholesterol transporter 2	P61916	NPC2	17 kDa	47
19	Lysosomal alpha-glucosidase	P10253	GAA	105 kDa	47
20	Dipeptidyl peptidase 4	P27487	DPP4	88 kDa	47

The protein identifications were filtered for a minimum of two peptides at 95% confidence and 99% protein confidence.

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