A naturally occurring inhibitor for the vegetalizing inducing factor has been incubated with different enzymes. Pancreatic ribonuclease, ribonuclease-T1, deoxyribunuclease, neur-aminidase as well trypsin and papain diminish the inhibitor only very slightly or not at all. Pronase, a proteolytic enzyme from Streptomyces griseus inactivates the inhibitor completely.

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