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4. Baker H, Frank O, Shapiro A, Hutner SH (1980) Assay of unconjugated pteridines in biologic fluids and tissues with Crithidia. In: McCormick DB, Wright LD (eds) Methods in enzymology. Academic Press, New York, pp 490?500
5. Bednar TW, Holm-Hansen O (1964) Biotin liberation by the lichen alga Coccomyxa sp. and by Chlorella pyrenoidosa. Plant Cell Physiol 5:297?303