8134
Deletion of the POR2 gene alone had no detectable phenotype , while yeasts with deletions of both the POR1 and POR2 genes were viable and able to grow on glycerol at 30 degrees C , albeit more slowly than delta por1 single mutants .
 POR2 gene, POR1, POR2 genes, delta por1 single mutants
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 POR2 gene, POR1, POR2 genes, delta por1 single mutants