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. 2005 Oct;71(10):5728–5734. doi: 10.1128/AEM.71.10.5728-5734.2005

FIG. 1.

FIG. 1.

Lineage and protein-level mutations in the evolved thermostable PTDH variants. Corresponding DNA-level mutations are shown in parentheses. The substitution shown in italics represents a mutation that does not increase PTDH thermostability. EP-PCR, error-prone PCR; SDM, site-directed mutagenesis; ∗, previous directed evolution work to improve activity and solubility (25).