18081
Base amino acid lysine residues play an important role in regulation of nuclear receptors [ e . g . , farnesyl X receptor ( FXR ) ] , leading to enhanced or suppressed biologic activity .
 Chemical: amino acid; Chemical: lysine; Chemical: farnesyl
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: amino acid; Chemical: lysine; Chemical: farnesyl