immune system
• at 49 days of age, mice exhibit patchy peribroncheolar mixed lymphocytic infiltrates
• at 49 days of age, pancreatic periductular, and to a lesser extent, peri-islet lymphocytic infiltrates
• at 49 days of age, mild to moderate predominantly lymphocytic gastric cellular infiltrates, involving one or more layers
• at 300 days of age, mild, lymphocytic infiltrates associated primarily with portal triads in the liver
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