8031
While there is strong evidence supporting the association of some subfamilies of alpha satellite with centromere function , the basis for establishing whether a given alpha satellite sequence is or is not designated a functional centromere is unknown , and attempts to understand the role of particular sequence features in establishing centromere identity have been limited by the near identity and repetitive nature of satellite sequences .
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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