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Insertion of alternatively spliced exon W into CREB mRNA during spermatogenesis results in a polycistronic RNA that encodes two novel internally translated CREB repressor isoforms called I - CREBs , consisting of the carboxy - terminal DNA - binding domain devoid of the transactivation domains .
 GENE: CREB mRNA; GENE: CREB repressor isoforms; GENE: I - CREBs
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: CREB mRNA; GENE: CREB repressor isoforms; GENE: I - CREBs