2735
It is based on coexpression of ( 1 ) a protein of interest , fused with the bacterial biotin ligase BirA , together with ( 2 ) a histone fused to a biotin acceptor peptide ( BAP ) , which is specifically biotinylated by BirA - fusion in the proximity of the protein of interest .
 Chemical: biotin; Chemical: biotin
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: biotin; Chemical: biotin