Now, what we were careful to do was, vitamin D is made by ultraviolet B rays and we wanted to separate our story from the vitamin D story. So we used ultraviolet A, which doesn't make vitamin D.
Ahora, fuimos cuidadosos con lo siguiente: la vitamina D es producida por rayos ultravioletas B y queríamos separar nuestra estudio del estudio de la vitamina D. Por tanto usamos rayos ultravioleta A, que no producen vitamina D.