21168
In solution , 1F1 and 1F1 - N raise the Tm of apo - PR by 3 . 5 - 5 degrees C as assayed by differential scanning fluorimetry ( DSF ) and show equivalent low - micromolar binding constants to both apo - PR and pepstatin : PR , assayed by backscattering interferometry ( BSI ) .
 Chemical: pepstatin
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: pepstatin