Table 2. Probability of PC1 and PC2 during MD Simulation.

system	principal component (PC)	proportion of variance (%)
XO	PC1	29.36
	PC2	15.83
XO-allopurinol	PC1	47.04
	PC2	14.81
XO-daidzin	PC1	43.54
	PC2	8.72
XO-puerarin	PC1	27.67
	PC2	16.91