12061
However , when directed to the nucleosome by fusion to core histone H2A or H2B , the non - histone tail forms an MCB that appears identical to that of the endogenous protein .
 core histone H2A, H2B, histone
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 core histone H2A, H2B, histone