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Active self - healing encapsulation of two antigens , ovalbumin and tetanus toxoid ( TT ) , in PLGA microspheres was adjusted by preparing blank microspheres containing different vaccine adjuvants ( aluminum hydroxide ( Al ( OH ) 3 ) or calcium phosphate ) .
 Chemical: PLGA; Chemical: aluminum hydroxide; Chemical: Al ( OH ) 3; Chemical: calcium phosphate
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; Chemical: aluminum hydroxide; Chemical: Al ( OH ) 3; Chemical: calcium phosphate