EGFKANLSLLRRPGEKTYTQRCRLFVGNLPADITEDEFKRLFAKYGEPGEVFINKGKGFGFIKLESRALAEIAKA ELDDTPMRGRQLRVRFATHAAALSVRNLSPYVSNELLEEAFSQFGPIERA VVIVDDRGRSTGKGIVEFASKPAARKAFERCSEGVFLLTTTPRPVIVEPL EQLDDEDGLPEKLAQKNPMYQKERETPPRFAQHGTFEYEYSQRWKSLDEM EKQQREQVEKNMKDAKDKLESEMEDAYHEHQANLARQDAMRRQEEARRAE ELHNQEMQKRKEMQLRQEEERRRREEEMMIRQREMEEQMRRQREESYS
SFPQ(276-598) with mutations L535A, L539A, L546A, and M549A