7073
Our aim was to optimize PLGA NP for SLP delivery with respect to encapsulation and release , using OVA24 , a 24 - residue long synthetic antigenic peptide covering a CTL epitope of ovalbumin ( SIINFEKL ) , as a model antigen .
 PLGA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 PLGA