19274
Using poly ( DL - lactic acid - co - glycolic acid ) microparticles ( MPs ) with an average diameter of 13 mu m , we have demonstrated controllable incorporation of defined numbers of MPs within human ES cell derived EBs , down to 1 MP per EB .
 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 
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Answer:
 Chemical: poly ( DL - lactic acid - co - glycolic acid )