Transient transfection assays of different prothrombin haplotypes. The normalized β-galactosidase (β-gal) corrected luciferase (luc) reporter gene activity is reported. Underlying vector constructs are outlined in Figure 1. Stopmut vectors are derived from respective standard vectors (nos. 1-3 in Figure 1) by mutagenesis of the luciferase stop codon (see “Materials and methods”). For the number of experimental repeats, see “Materials and methods.” Error bars represent the standard error of mean. The leftmost column is used for normalization and has no error bar.