18969
Osteopontin ( OPN ) , an extracellular matrix protein , has a functional arginine - glycine - aspartic acid ( RGD ) domain for binding to integrin .
 Chemical: arginine; Chemical: glycine; Chemical: aspartic acid
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: arginine; Chemical: glycine; Chemical: aspartic acid