3769
Active self - healing microencapsulation of manufacturing process - labile TT in PLGA was found to : a ) obviate micronization - and organic solvent - induced TT degradation , b ) improve antigen loading ( 1 . 4 - 1 . 8 wt . % TT ) and encapsulation efficiency ( ~ 97 % ) , c ) provide nearly homogeneous distribution and stabilization of antigen in polymer , and d ) provide improved in vitro controlled release of antigenic TT .
 Chemical: PLGA
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: PLGA