The rat had been purchased from Charles River ... tan-red mass with an irregular surface in the mediastinal region of the thoracic cavity. The mass created a substantial space-occupying lesion ...
A 37-week-old male Wistar rat of strain WNIN (Wistar/NIN) from the breeding colony of the International Institute of Biotechnology and Toxicology was presented for necropsy with the history of a ...
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