3953
Based on the requirement for CREM / ICER and Rad6B proteins in spermatogenesis , we determined expression of Cdc34 , Rad6B , CREM / ICER isoforms , and the Skp1 - Cullin - F - box ubiquitin protein ligase subunits Cul - 1 and Cul - 2 , which are associated with Cdc34 activity during murine testicular development .
 GENE: CREM; GENE: ICER; GENE: Rad6B proteins; GENE: Cdc34; GENE: Rad6B; GENE: CREM; GENE: ICER; GENE: Skp1; GENE: Cullin; GENE: ubiquitin; GENE: Cul - 1; GENE: Cul - 2; GENE: Cdc34
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: CREM; GENE: ICER; GENE: Rad6B proteins; GENE: Cdc34; GENE: Rad6B; GENE: CREM; GENE: ICER; GENE: Skp1; GENE: Cullin; GENE: ubiquitin; GENE: Cul - 1; GENE: Cul - 2; GENE: Cdc34