A, Time course of N-V5-tagged aromatase-WT construct expression in 231 cells. B, Transcript levels of V5-aromatase WT and mutant constructs and loading control beta actin in 231 cells after 24hrs. C, Expression of N-terminally tagged V5-aromatase constructs, endogenous aromatase (Total aromatase) and endogenous control Gapdh in 231 cells untreated or treated with androstenedione for 2 days (A4–2days). D, Estradiol levels of V5-aromatase WT and K108R/K108Q transfected cells treated with/without 10nM androstenedione for 2 days (A4–2days). E, Estradiol levels of V5-aromatase WT and K440R/K440Q transfected cells with/without 10nM androstenedione after 2 days (A4–2 days). Data is representive of three independent experiments carried out in triplicates with mean ± SEM *** p<0.0001, * p<0.05.