N72A/A167R/T192K
A167R/T192K/D222E
S138A/A167R/T192K
N72A/A167R/T192K/D222E
N72A/S138A/A167R/T192K
N72A/A167R/T192K/D229A
N72A/S138A/A167R/T192K/D222E
N72A/A167R/T192K/D222E/D229A
K61R/N72A/A167R/T192K/D222E
N72A/S138A/A167R/T192K/D222E/D229A
K61R/N72A/S138A/A167R/T192K/D222E
K61R/N72A/A167R/T192K/D222E/D229A
K61R/N72A/S138A/A167R/T192K/D222E/D229A
N72A/S138A/A148Q/A167R/T192K/D222E/D229A
N72A/S138A/A167R/I185V/T192K/D222E/D229A