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243. Cosby, E., and Sumner, J. B. (1945), Arch. Biochem., 8, 259. 



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245. Theorell, H., Holman, R. T., and Akeson, A. (1947), Acta Cheyn. Scand., 1, 571. 



246. Holman, R. T., Panzer, F., and Schweiger, B. S. (1950), Arch. Biochem., 26, 199. 



247. Lebedev, S. I. (1947), Doklady Nauk. S.S.R., 58, 85. 



248. Thompson, C. R. (1949), Agron. y., 41, 491. 



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