3143
To analyze the structure - function relationship for the v - fos protein , we constructed in - frame insertion and deletion mutants of the v - fos gene carried by FBJ - MuSV , and expressed them in chicken primary cells using retrovirus vectors .
 Anatomy: cells
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
Answer:
 Anatomy: cells