3763
Herein , we describe the detailed development of a simple and effective method to microencapsulate vaccine antigens in poly ( lactic - co - glycolic acid ) ( PLGA ) by simple mixing of preformed active self - microencapsulating ( SM ) PLGA microspheres in a low concentration aqueous antigen solution at modest temperature ( 10 - 38 degrees C ) .
 Chemical: poly ( lactic - co - glycolic acid ); Chemical: PLGA; Chemical: PLGA
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 ( lactic - co - glycolic acid ); Chemical: PLGA; Chemical: PLGA