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Pyridoxal, pyridoxamine and pyracin-5 were found to be inactive singly in replacing vitamin B10 or vitamin B11 in chick nutrition. The biological vitamin Be activity of these three compounds is approximately > 1/2, 4/5, and 0 respectively. Vitamin B6 deficiency symptoms in the chick were found to include a decreased clotting time, hyperprothrombinemia, small spleens and anemia.
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Luckey et al. (1945) studied this question.
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