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. 2020 Apr 28;13:1178636120913280. doi: 10.1177/1178636120913280

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© The Author(s) 2020

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (https://creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 4. — Partial characterization of crude keratinase activity (enzyme-substrate reaction). Effects of (A) temperature, (B) pH, (C) reaction time, (D) metal ions, and (E) substrates.