Table 2.

Top ten metabolites showing high loading in principal component analysis.

Metabolite	KEGG ID	PC1 loading
Creatine riboside	not listed	0.92
Guanosine	C00387	0.90
Isocitric acid	C00311	0.89
Creatinine	C00791	0.86
Acetylcarnitine	C02571	0.86
S-Adenosylhomocysteine	C00021	0.85
Argininosuccinic acid	C03406	0.84
Symmetric dimethylarginine	C03626×	0.84
S-Adenosylmethionine	C00019	0.82
Kynurenine	C00328	0.77

KEGG, Kyoto Encyclopedia of Genes and Genomes; PC1, first principal component.