5777
SS phages are genetically enginnered by replacing 2 N - terminal amino acids of the p8 coat protein of the fd phage .
 Chemical: N; Chemical: amino acids
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: N; Chemical: amino acids