Table 1.

Data of principal component analysis of metabolites in senescence-accelerated mouse prone 10 (SAMP10) and ddY mice.

Mouse	Condition	Treatment	PC1	PC2	PC3	PC4
SAMP10	Group	Control	–0.07338	0.03785	–0.00872	–0.00107
			–0.03254	–0.00421	–0.02051	–0.00247
			–0.07107	0.03476	–0.00459	–0.00835
			–0.03904	–0.00196	–0.00954	–0.01278
		Theanine	–0.07666	0.02389	0.00652	0.01317
			–0.06840	0.02850	–0.00088	0.00442
			–0.07974	0.02936	0.01287	0.00789
	Confrontation	Control	–0.04038	0.00882	0.01114	–0.02924
			–0.04848	–0.01130	0.00611	–0.01154
			–0.06143	0.00294	0.01720	0.00465
			–0.00513	–0.06122	0.00394	0.00318
		Theanine	0.00952	–0.10804	–0.01076	0.00681
			–0.00350	–0.05210	0.01452	0.02649
			0.01278	–0.11432	–0.00996	–0.01817
			–0.02355	–0.03912	0.00415	–0.00177
ddY	Group	Control	0.01670	0.00225	–0.01376	–0.02015
			0.01147	0.00520	–0.01819	–0.00116
			0.02528	0.00516	–0.01773	0.01430
		Theanine	–0.00682	0.00349	0.00519	0.01326
			–0.04108	–0.01144	–0.00352	0.02319
			0.02797	0.00704	0.00463	0.00567
			0.17347	0.04502	0.02486	0.01496
	Confrontation	Control	0.09426	0.02753	–0.00925	0.01045
			0.04019	0.00548	–0.02618	–0.01805
			0.09584	0.02586	0.01472	0.00620
			–0.01268	–0.03017	–0.02188	0.02948
		Theanine	0.07307	0.01096	0.02558	–0.03502
			0.06694	0.01848	0.00251	0.00074
			0.04413	0.00230	–0.02052	–0.02141
			0.14107	0.03713	0.02662	0.01047

Note, mice were housed in groups of six per cage. After establishing territorial consciousness by single housing for one month, then, confrontational housing was carried out for one month. These mice ingested theanine or control water. The color gradient in each column indicates the level of metabolites. The darker the red, the higher than the overall average, and the darker the blue the lower than the overall average.