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Influence of Pteridines on the Production of Vitamin B12 by Trypanosomid Flagellates

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NATHAN, H., BAKER, H. & FRANK, O. Influence of Pteridines on the Production of Vitamin B12 by Trypanosomid Flagellates. Nature 188, 35–37 (1960). https://doi.org/10.1038/188035a0

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