Table 2. Classification of plant species based on the in vitro PBMCs proliferation using MTT assay

Classification based on ethanol extract bioactivity	Plant species	IC₅₀ (or EC₅₀) (μg/ml) of the most potential fraction
Stimulate the in vitro PBMCs proliferation	Glycyrrhiza glabra L	EC_50(CHCl3)=10
Stimulate the in vitro PBMCs proliferation	Astragalus membranaceus	EC_50(CHCl3)=50
Inhibit the in vitro PBMCs proliferation	Cassia alata L.	IC_50(CHCl3)=16.21
	Wedelia chinensis	IC_50(CHCl3)=16.12
	Lonicera japonica	IC_50(CHCl3)=142.3
	Caesalpinia sappan L.	IC_50(EA)=36.52
	Schefflera heptaphylla	IC_50(CHCl3)=34.99
	Piper betle	IC_50(CHCl3)=27.81
No effect on the in vitro PBMCs proliferation	Cassia tora L	-
	Coscinium fenestratum	-
	Angelica sinensis	-
	Achyranthes aspera L	-
	Camellia sinensis	-