Table 2.

Proteins with the Highest Abundance and Count Averaged Across Relevant Samples^a

protein	average abundance ± SD	protein	average count ± SD
Human β-casein	8.85 × 1010 ± 4.49 ×1010	Human β-casein	285.4 ± 86.8
Bovine β-casein	4.18 × 1010 ± 1.60 × 1010	Bovine β-casein	185.2 ± 27.4
Human αs1-casein	2.34 × 1010 ± 1.63 × 1010	Bovine αs1-casein	138.9 ± 18.6
Bovine κ -casein	2.30 × 1010 ± 1.50 × 1010	Bovine κ -casein	90.2 ± 18.6
Bovine αs1-casein	2.17 × 1010 ± 1.28 × 1010	Human αs1-casein	88.8 ± 39.3
Human lactoferrin	2.12 × 1010 ± 1.67 × 1010	Human osteopontin	64.7 ± 35.5
Human α-lactalbumin	2.06 × 1010 ± 1.65 × 1010	Human PIgR	63.7 ± 19.5
Bovine GLYCAM1	1.58 × 1010 ± 8.65 × 109	Human lactoferrin	61.2 ± 37.8
Bovine β-lactoglobulin	1.54 × 1010 ± 1.47 × 1010	Bovine β-lactoglobulin	57.2 ± 13.7
Human osteopontin	1.33 × 1010 ± 1.25 × 1010	Bovine αs2-casein	54.3 ± 9.6
Human PIgR	7.30 × 109 ± 3.77 × 109	Bovine GLYCAM1	43.8 ± 6.4
Bovine αs2-casein	5.94 × 109 ± 2.91 × 109	Bovine PIgR	32.4 ± 5.1
Human serum albumin	5.19 × 109 ± 4.79 × 109	Human bile salt-activated lipase	31.8 ± 14.2
Human bile salt-activated lipase	5.06 × 109 ± 4.56 × 109	Human tenascin	21.7 ± 21.7
Human κ-casein	2.86 × 109 ± 2.13 × 109	Human κ-casein	20.4 ± 7.1

^aHuman protein n = 14; bovine protein n = 6.