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Substances commonly known as vaccines, sera, toxins, toxoids, antitoxins, and antigens and biological products of such nature for human or veterinary use. The standards maintained at the International Laboratory for Biological Standards, Stantans Serum Institute, Copenhagen, and at the Central Veterinary Laboratory, Weybridge, Surrey, U.K., and such other laboratories recognized by W.H.O from time to time, and such further standards of strength, quality and purity as may be prescribed. 45