Response of dorsal hand veins of 72 healthy males to bradykinin (1, 50, and 250 ng min-1) during preconstriction with phenylephrine with regard to the NOSIII G894T (a) GG (G894T wild type) (▪), GT (•), TT (▾); and T-786C (b) TT (T-786C wild type) (▪), TC (•), CC (▾); genotypes and the CYBA C242T genotype (c) CC (242T wild type) (▪), CT (•), TT (▾)