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In recent years , the discovery of green fluorescent protein ( GFP ) by Roger Y. Tsien and others , hybrid systems and quantum dots have enabled assessing protein location and function more precisely .
 person: Roger Y. Tsien
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
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Text: {0} 
Answer:
 person: Roger Y. Tsien