11577
Structural considerations and mutational data indicate that NF - YB ubiquitination at Lys138 precedes and is equivalent to H2B Lys120 monoubiquitination , important in transcriptional activation .
 Chemical: Lys138; Chemical: Lys120
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: Lys138; Chemical: Lys120