1429
ER was positive in 13 and PR was positive in 12 of the 20 samples.
 protein: ER; protein: PR
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: ER; protein: PR