931
CCAAT / enhancer - binding protein isoforms beta and delta are expressed in mammary epithelial cells and bind to multiple sites in the beta - casein gene promoter .
 GENE: CCAAT / enhancer - binding protein isoforms beta and delta; GENE: beta - casein gene promoter
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: CCAAT / enhancer - binding protein isoforms beta and delta; GENE: beta - casein gene promoter