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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 .
 Chemical: trimethine cyanines
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: trimethine cyanines 
Answer:
 Chemical: trimethine cyanines