Sep 09, 2012 · Keywords: Adult, human age, laboratory rat, physiology, puberty, rat age. INTRODUCTION. The laboratory rat is an inevitable part of today's biomedical research. They are recognized as the preeminent model in numerous fields, including neurobehavioral studies, cancer and toxicology. It is difficult to evaluate the number of animals employed in Cited by: 808. The latest free porn movies and sex videos. The ultimate xxx collection! Download or stream HD porn for free!
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A laboratory rat or lab rat is a rat of the species Rattus norvegicus domestica which is bred and kept for scientific research. While less commonly used for research than mice, rats have served as an important animal model for research in psychology and biomedical science.