15677
We apply DFTB in a QM / MM framework to perform vibrational analysis of buried aspartic acids in bacteriorhodopsin and channelrhodopsin - 2 .
 Chemical: aspartic acids
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: aspartic acids