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The psi zeta gene has a nonsense mutation in exon 1 but has identical promoter sequence and RNA processing sites to the zeta gene , raising the possibility that both psi zeta and zeta are transcriptionally active .
 GENE: psi zeta gene; GENE: zeta gene; GENE: psi zeta; GENE: zeta
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: psi zeta gene; GENE: zeta gene; GENE: psi zeta; GENE: zeta