Table 6. Effects of fractional extracts on IL - 2 production by PBMCs

Chloroform fraction	IL – 2 concentration (pg/ml) (mean ± SD)
	IC25	IC50	IC75
Schefflera heptaphylla	20.61 ± 0.66	10.37 ± 0.51	5.65 ± 0.57
Cassia alata L.	18.86 ± 0.40	13.95 ± 0.28	-
Piper betle	26.53 ± 0.39	-	-
Lonicera japonica	13.04 ± 0.16	-	-
Wedelia chinensis	18.60 ± 0.28	7.92 ± 0.33	4.71 ± 0.12
Caesalpinia sappan L	20.50 ± 1.26	-	-
Control	37.21 ± 0.24

-: not detectable