4787
The finding that the chimeric TdT : : Pol beta protein possessed significant template - dependent polymerase activity suggests that aa 1 - 60 of Pol beta are involved in template utilization during the polymerization reaction , as suggested by the previous finding that the 8 - kDa N - terminal domain of Pol beta possesses ssDNA - binding activity [ Kumar et al . , J .
 chimeric TdT, Pol beta protein, Pol beta, Pol beta
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 chimeric TdT, Pol beta protein, Pol beta, Pol beta