TABLE 3.

GP levels in SF and NP normalized to protein content

GP	SF (n = 70)	% Total (SF Mean)	NP (n > 66)	% Total (NP Mean)	NP/SF (% Total)
xPE	0.0035 ± 0.0003	0.02	6.7 ± 0.5	9.8	491
NAPE	0.032 ± 0.004	0.14	5.0 ± 0.5	7.4	53.3
PE	0.108 ± 0.009	0.47	1.636 ± 0.5	2.4	5.1
PC	23.01 ± 1.36	99.1	52.4 ± 6	76.4	0.8
PS	0.024 ± 0.002	0.10	ND	ND	ND
PAF_LL	0.012 ± 0.001	0.05	0.08 ± 0.01	0.12	2.3
LPC	0.031 ± 0.003	0.13	2.7 ± 0.2	4.0	29.7
LPC/PC	0.0014		0.0519		37.1

GPs in SF and NP were quantified using LC-MS/MS as described in Methods. Amounts of each GP are expressed as the mean normalized to total the protein content of SF or NP (ng/μg). For each fraction, we used the mean values to estimate proportions of each GP (% Total) and to calculate the relative enrichment in NP compared with SF (NP/SF). We also determined the proportion of LPC to PC (LPC/PC). Levels of PS in NP were very low or not detectable (ND).