Use of only male rats unacceptable

I read recently about a research doctor (Jeffrey Mogil, of McGill University) who was challenging the use of only-male rat research. As it turns out, in about 80% of scientific studies, only male rats are used. Why? Because of “menstrual cycles and the variability in results that it might cause.”

Since both men and women get diseases, don’t you think we would want to know the causes and impact of treatments on both sexes? It seems so obvious to me, yet one doctor has to launch a huge campaign. I personally applaud his efforts. But I am left wondering: Do the rats that doctors use to research breast  cancer have breasts?

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