Table 1.

Purification of the epithelial defensin inducer from yeast extract

	Weight, mg	Specific activity, unit/mg	Total units	Yield, %
Yeast extract	50  × 103	1	5  × 104	100
Acetone precipitate	2.7  × 103	10.67	2.88  × 104	58
Isoleucine	490	50.80	2.49  × 104	50

The defensin-inducing activity was purified as described in Materials and Methods. A unit is defined as the amount of substance that effects peak stimulation of defensin expression.