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Using coumarin - 6 as a model drug and fluorescent marker , we show that liposome surface modification by PLL dramatically increased delivery to mouse retina segments after eye drop administration .
 Chemical: coumarin - 6; Chemical: PLL
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: coumarin - 6; Chemical: PLL