Table 2.

Discriminant peaks significantly different between fertile (n. 15) and infertile (n. 15) men.

m/z 1	Uniprot ID (Accession Number)	Protein Identity	Peptide Sequence	Study Groups and Peptide Expression Level	p Value 2
2331	P04279	SEM I; Fragm:330–349	ITIPSQEQEHSQKANKISYQ	↑Fertile/↓Infertile	0.007
2362	Q02383	SEM II; Fragm:248–267	HGPKDIFTTQDELLVYNKNQ	↑Fertile/↓Infertile	0.001
2482	P04279	SEM I; Fragm:195–215	VLQTEELVANKQQRETKNSHQ	↑Fertile/↓Infertile	0.00003
2893	P04279	SEM I; Fragm:428–453	HGSHGGLDIVIIEQEDDSDRHLAQHL	↑Fertile/↓Infertile	0.0000006
3059	P04279	SEM I; Fragm:248–273	HGSKDIFSTQDELLVYNKNQHQTKNL	↑Fertile/↓Infertile	0.001
3083	Q02383	SEM II; Fragm:248–273	HGPKDIFTTQDELLVYNKNQHQTKNL	↑Fertile/↓Infertile	0.010
3938	Q02383	SEM II; Fragm:549–582	ESSESHNIVITEHEVAQDDHLTQQYNEDRNPIST	↑Fertile/↓Infertile	0.001

^1. The m/z values of precursor ions refer to average masses MH⁺. ^2. The p values were calculated with unpaired t-test on peak intensity; significance was set at a p value less than 0.05.