I have reviewed the article "Impairment of Multicycle Influenza Virus Growth in Vero (WHO) Cells by Loss of Trypsin Activity" which shows that the molecular weight of the substance(s) has been determined but not the identity of the substance.  The article also lists some of the possible known trypsin-inhibitors that it could possibly be. 

If anyone can provide any information it will be most useful.  Thanks in advance.

Emery

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