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The underwater adhesion of marine mussels relies on mussel foot proteins ( mfps ) rich in the catecholic amino acid 3 , 4 - dihydroxyphenylalanine ( Dopa ) .
 Chemical: 3 , 4 - dihydroxyphenylalanine; Chemical: Dopa
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: 3 , 4 - dihydroxyphenylalanine; Chemical: Dopa