Gender in a Pill

I read, with great skepticism, a year-old article with an astounding premise: that gender can be changed by the manipulation of one gene!

The article is here.

The idea is that gender depends, at least in part, on the competing action of genes that are shared by both sexes.  That means that we all maintain the ability to change from one to the other, potentially…  The therapy actually changed the reproductive organs of the mice upon which it was conducted, and without adverse effect.

Is it possible?  If so, it would turn the entire concept of transgenderism upside down!

The experiment was done with adult mice, such that presumably gender could then become a choice for fully formed people! (Not sure if you could go back and forth or not…)

Question is: which gender would you choose, if you could choose?