Table II. Bootstrap ratios of metabolites (absolute values) for the six organs/species.

The bootstrap ratios of metabolites were obtained from 3,000 bootstrap samples for the first three principal components. Values denoted in boldface are significant at α = 0.01, while underlined values are significant at α = 0.05.

No.	Metabolite	PC1	PC2	PC3
1	Ala	0.15	1.30	0.97
2	Ile	3.40	0.17	0.67
3	Phe	3.00	0.42	0.29
4	Ser	2.30	0.36	0.90
5	Thr	3.00	0.45	0.02
6	Tyr	3.10	0.28	0.79
7	Val	4.00	0.21	0.77
8	Asp	0.40	0.84	0.85
9	Citric acid	2.40	0.36	1.00
10	Glu	0.17	1.20	0.60
11	Malic acid	1.20	0.66	0.78
12	Fru	2.70	0.25	1.00
13	Glc	2.90	0.22	0.62
14	Suc	0.89	2.10	0.82
15	Myoinositol	0.40	1.10	0.92
16	Phosphoric acid	0.73	0.21	0.02