8591
Based on restriction enzyme analysis , Southern blots , polymerase chain reaction analysis and DNA sequencing , it was confirmed that the three overlapping clones isolated cover the entire cHO - 1 gene , as well as approximately 10 kb of the flanking regions on both ends .
 cHO - 1 gene
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 cHO - 1 gene