Relative transient expression levels of recombinant wild-type and variant protein S in COS-1 cells.

Mean, relative concentration of protein S expressed after correction for transfection efficiency. A value of 100% was assigned to wild-type protein S. Each experiment was performed at least 3 times in duplicate. Unpaired t test was used to compare the levels between wild-type protein S and the variants; *P = .62; **P < .0001.