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Glaucoma is a complex neurodegenerative disease that involves interactions among multiple signaling pathways , ultimately leading to progressive retinal ganglion cell ( RGC ) death .
 Chemical: retinal
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: retinal