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Purification and Characterization of Phytase Produced by Aspergillus niger Isolated from Poultry Farm Soil Using Submerged Fermentation: doi.org/10.26538/tjnpr/v5i6.17. Trop J Nat Prod Res. 2021;5(6):1083-1087. Accessed January 2, 2026. https://www.tjnpr.org/index.php/home/article/view/629