19269
Delivery of definable number of drug or growth factor loaded poly ( dl - lactic acid - co - glycolic acid ) microparticles within human embryonic stem cell derived aggregates .
 Chemical: poly ( dl - lactic acid - co - glycolic 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: poly ( dl - lactic acid - co - glycolic acid )