1741
The choice of digestion enzymes used in this study does not affect uptake of either pravastatin ( an organic anion probe substrate for Oatp transporter ) or metformin ( an organic cation probe substrate for Oct transporter ) .
 Chemical: pravastatin; 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: pravastatin; Chemical: metformin