

References
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Sun LZ, Currier NL, Miller SC. The American coneflower: a prophylactic role involving nonspecific immunity. J Altern Complement Med. 1999 Oct;5(5):437-46.
Rehman J, Dillow JM, Carter SM, Chou J, Le B, Maisel AS. Increased production of antigen-specific immunoglobulins G and M following in vivo treatment with the medicinal plants Echinacea angustifolia and Hydrastis canadensis. Immunol Lett. 1999 Jun 1;68(2-3):391-5.
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