2150
The mechanisms underlying glaucomatous involvement of the central areas are not known : the most likely hypothesis is that this event is the result of an anterograde transynaptic neurodegeneration triggered by ganglion cells ' death .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None