15512
Urea - polyacrylamide gel electrophoresis ( PAGE ) of partially dephosphorylated beta - casein showed a number of bands , depending on the final level of phosphorylation .
 Chemical: Urea; Chemical: polyacrylamide
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: Urea; Chemical: polyacrylamide