1415
Our results emphasize the role of PRL as a regulator of the immune response and indicate that the Stat factors mammary gland factor-Stat5 and Stat1 play a role in the regulation of gene expression during T cell development .
 protein: Stat factors; protein: PRL; protein: mammary gland factor-Stat5; protein: Stat1
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 protein: Stat factors; protein: PRL; protein: mammary gland factor-Stat5; protein: Stat1