Table 1. The ten most abundant proteins in UCB. The proteins from male and female UCB are sorted according to the unique peptides that were identified.

Representative accession numbers	Protein name	Gender (Top 10)	Number of unique peptides (Female)	Number of unique peptides (Male)
IPI00478003	Alpha-2-macroglobulin precusor	Male, Female	75	69
IPI00745872	Isoform 1 of serum albumin precursor	Male, Female	48	52
IPI00022229	Apolipoprotein B-100 precursor	Male, Female	169	155
IPI00783987	Complement C3 precursor (Fragment)	Male, Female	98	83
IPI00032291	Complement C5 precursor	Male, Female	45	42
IPI00029739	Isoform 1 of Complement factor H precursor	Male, Female	45	45
IPI00017601	Ceruloplasmin precursor	Male, Female	39	39
IPI00019568	Prothrombin precursor (Fragment)	Male, Female	29	28
IPI00022418	Isoform 1 of Fibronectin precursor	Male, Female	57	49
IPI00292530	Inter-alpha-trypsin inhibitor heavy chain H1 precursor	Male, Female	32	27
IPI00022463	Serotransferrin precursor	Male, Female	39	39