books.google.com - This is an outstanding survey describing medical drugs of plant origin, such as Echinacea edications, lentinan and mistletoe lectin, which have proven to be effective as immunostimulants. At a time when ever greater importance is being placed on preventive and alternative medicine, the study provides...http://books.google.com/books/about/Immunomodulatory_agents_from_plants.html?id=ReY_8gfGL7wC&utm_source=gb-gplus-shareImmunomodulatory agents from plants