[Activation of blood phospholipases by proteins present in crude trypsin extracts]

Blood phospholipase activity in increased by crude trypsin (Sigma). This activity is not induced by trypsin itself but by some proteins contained in the extract and isolated from trypsin by G 75 Sephadex filtration. Purified trypsin or pure trypsin (Fluka, Merck, Boehringer) do not increase phospholipase activity.