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Shedding light on grey matter : Fluorescent trimethine cyanines were evaluated as imaging probes for neurofibrillary tangles in post - mortem brain sections of Alzheimer ' s disease patients .
 trimethine cyanines
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 trimethine cyanines