Nattokinase: The Enzyme of Enzymes - Article describing the effect of this enzyme and an interview with Dr. Nicholas Calvino, the article's author. - http://www.willner.com/article.aspx?artid=88
Natto (Nattokinase) - History and scientific details of the soy product and the fibrinolytic enzyme it contains. [Information in English and Japanese] - http://www.jafra.gr.jp/eng/natto.html