20274
Polycomb - group RING finger homologs ( PCGF1 , PCGF2 , PCGF3 , PCGF4 , PCGF5 , and PCGF6 ) are critical components in the assembly of distinct Polycomb repression complex 1 ( PRC1 ) - related complexes .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None