2644
In this study , expression of genes involved in the phenylpropanoid pathway was studied in the flavedo ( outer coloured part of the peel ) and albedo ( inner white part ) in response to pathogen infection .
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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:
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