Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Mutations in second generation SC PEP variants with the greatest enhancement in pepsin resistance. The PYMOL image illustrates the location of the mutations M511L, I406V, K103T, I514V and V474I, colored in pink, brown, green, blue, and black, respectively. The active site residues are represented as orange sticks.
