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Here , we used experimental techniques and atomistic simulations to investigate the influence of carnosine , a dipeptide naturally occurring in the brain , on A beta aggregation .
 Chemical: carnosine; Chemical: dipeptide
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: carnosine; Chemical: dipeptide