21640
Ureido - derivatized polymers , such as poly ( allylurea ) ( PU ) and poly ( L - citrulline ) derivatives , exhibited upper critical solution temperature ( UCST ) behavior under physiological buffer conditions as we previously reported .
 Chemical: poly ( allylurea ); Chemical: poly ( L - citrulline )
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: poly ( allylurea ); Chemical: poly ( L - citrulline )