4.1.99.5 43 - Tm of recombinant mutant C107A/C117A 749051 4.1.99.5 46 - Tm of recombinant mutant C71S 749051 4.1.99.5 47 - Tm of recombinant mutants C71A, C107A, C117A, and C71A/C117A 749051 4.1.99.5 48 - Tm of recombinant mutant C71A/C107A 749051 4.1.99.5 53 - Tm of recombinant wild-type 749051 4.1.99.5 100 - boiling destroys enzyme activity 648392, 648393 4.1.99.5 100 - sensitive to boiling 648391