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Transfer of metformin across the rat placenta is mediated by organic cation transporter 3 ( OCT3 / SLC22A3 ) and multidrug and toxin extrusion 1 ( MATE1 / SLC47A1 ) protein .
 Chemical: metformin
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: metformin