Well, it turns out that those cells used in that laboratory, they're male cells, and the animals used in the animal studies were male animals, and the clinical trials have been performed almost exclusively on men.
Pois resulta que esas células empregadas nese laboratorio, son células masculinas, e os animais empregados nos  estudos con animais eran machos, e os ensaios clínicos fixéronse case exclusivamente en homes.