Table 2. Variable contributions to SPE_k statistic.

WI Liver No.	k = 1 hr	k = 2 hr	k = 3 hr	k = 4 hr	k = 5 hr	k = 6 hr
1	Lactate	Ornithine	Arginine, Lactate, Ornithine	Arginine, Glutamate	Albumin, Ornithine	Glutamate, Ornithine, Tyrosine
2	Glutamine	Ornithine	Arginine, Lactate	Arginine, Glutamate	Albumin, Ornithine	Glutamate
3	Lactate	Ornithine	Arginine, Ornithine	Arginine, Glutamate, Ornithine	Albumin, Ornithine	Glutamate, Ornithine, Tyrosine
4	Alanine	Ornithine	Arginine, Lactate, Ornithine	Arginine, Glutamate	Albumin, Ornithine	Ornithine
5	Lactate	Ornithine	Tyrosine	Albumin, Glutamate	Albumin, Ornithine	Glutamate, Tyrosine
6	Aspartate	Ornithine	Arginine, Ornithine	Arginine	Albumin, Ornithine	Glutamate, Ornithine
7	Glutamine	Ornithine	Arginine, Ornithine	Arginine, Glutamate, Ornithine	Ornithine	Glutamate, Tyrosine