25979
At present , gene expression and pathology changes were systematically studied in small intestine , liver , kidney , and brain tissue from male SAGE Mdr1a - , Bcrp - , and Mrp2 - knockout rats versus wild - type Sprague Dawley controls .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None