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The foam stability is one-of the most important criteria to evaluate the quality of green draft beer.The fact that Lipid Transfer Protein 1(LTP1) is a kind of most important beer foam promoting protein fraction in beer has been proved.Proteinase A is a product of yeast Saccharomyces cerevisiae ceils,encoded by PEP4 gene in yeast S.cerevisiae genome,the degradation of LTP1 by proteinase A could lead to the decline of beer foam stabitization in green draft beer.