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The ability of spt2 mutations to suppress the transcriptional interference caused by the delta promoter insertion his - 4 - 912 delta correlates with an increase in wild - type HIS4 mRNA levels .
 spt2 mutations, delta promoter insertion his - 4 - 912 delta, wild - type HIS4 mRNA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 spt2 mutations, delta promoter insertion his - 4 - 912 delta, wild - type HIS4 mRNA