18090
In conclusion , four highly conserved lysine residues of hFXR , K122 , K210 , K339 , and K460 , have been identified that play a critical role in FXR target gene regulation and molecular interaction ( protein - protein and protein - DNA ) .
 Chemical: lysine
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: lysine