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| Enzyme source | Activity(different substrate, U/ml) | Reference | |
| α-keratin (keratin azure) | β-keratin (feather meal or azokeratin) | ||
| B. licheniformis MKU3 | 55.0 | NAa | [12] |
| E. coli pETproK3 | 74.3 | NAa | [12] |
| B. megaterium pWHK3 | 95.0 | NAa | [12] |
| P. pastoris pPICZαA-kerA | NAa | 285.0 | [13] |
| P. pastoris pPZK3 | 135.0 | NAa | [9] |
| P. pastoris pPICZαA-kerAopti1 | 320.0 | 590.0 | This study |
NA, not available.
