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As an initial step towards the characterization of replicative DNA polymerases of trypanosomes , we have cloned , sequenced and examined the expression of the Trypanosoma ( Trypanozoon ) brucei brucei gene that encodes the DNA polymerase alpha catalytic core ( pol alpha ) .
 DNA polymerases of trypanosomes, DNA polymerase alpha catalytic core, pol alpha
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 DNA polymerases of trypanosomes, DNA polymerase alpha catalytic core, pol alpha