1658
Yeast mutants assigned to the pet complementation group G104 were found to lack alpha - ketoglutarate dehydrogenase activity as a result of mutations in the dihydrolipoyl transsuccinylase ( KE2 ) component of the complex .
 pet, alpha - ketoglutarate dehydrogenase, dihydrolipoyl transsuccinylase, KE2
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 pet, alpha - ketoglutarate dehydrogenase, dihydrolipoyl transsuccinylase, KE2