Total number of rats used in toxicity studies at the Safety Assessment Research Unit (black line) and total number of reported regulatory toxicity studies, one month or longer (black bars) and shorter investigative toxicity/mechanistic studies (grey bars) during the years 2006–2010.

<p>Total number of rats used in toxicity studies at the Safety Assessment Research Unit (black line) and total number of reported regulatory toxicity studies, one month or longer (black bars) and shorter investigative toxicity/mechanistic studies (grey bars) during the years 2006–2010.