5620
Differential screening of mitochondrial cDNA libraries from male - fertile and cytoplasmic male - sterile sugar - beet reveals genome rearrangements at atp6 and atpA loci .
 atp6, atpA loci
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 atp6, atpA loci