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(A) Thermal unfolding curves for WT HP36 and its mutants; (B) Urea unfolding curves for WT HP36 and its mutants. Closed circles (●) represents the WT HP36, R55M is represented by open circles (○), D44N by closed triangle (▼), D44NR55M by open triangle (△), F47L by closed squares (■) and F47lR55M by open squares (□).
