Table 2. Trypsin inhibitory activities of SdPI and other Kunitz-type venom peptides derived from venomous animals.

Source	Species	Name	Ki (M)
Snake	B. fasciatus	Bungaruskunin	9.8×10−4
Spider	O. huwena	HWTX-XI	2.3×10−10
Sea anemone	A. sulcata	kalicludines	3.0×10−8
Scorpion	L. mucronatus	SdPI	1.6×10−7