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. 2019 Jun 10;14:4293–4307. doi: 10.2147/IJN.S200556

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© 2019 Wang et al.

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Optimization of substrate buffer pH and incubation time. Detection methods: RLU_S9 obtained for all tests, which 1,250 pmol L⁻¹ of the CPP standards.

Abbreviation: RLU, relative light units.