26400
In this study , we developed an original freeze - dried electrofocusing native gel over polyimide film ( native - gel film ) for scanning protein analysis using synchrotron radiation excited X - ray fluorescence ( SPAX ) .
 Chemical: polyimide
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: polyimide