Although the genetic defect was not known for many years, it was identified in the year as a mutation in the gene MERTK. Second, Lewis rats are prone to develop a spontaneous transplantable lymphatic leukaemia. American Heart Association. In 18th century Europe, wild brown rats ran rampant and this infestation fueled the industry of rat-catching. The Sprague Dawley rat is an outbred multipurpose breed of albino rat used extensively in medical and nutritional research.
Salma. Age: 29.
Lastly, when in advanced age, they sometimes develop spontaneous glomerular sclerosis.
Leyla. Age: 24.
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Retrieved 15 September American Heart Association. Over time, breeding the rats for these contests may have produced variations in color, notably the albino and hooded varieties. Inbred strains are also available but are not as commonly used as inbred mice.