914
RU 486 tested at an equal concentration as progesterone significantly inhibited the production of the blocking factor , while RU 43044 was without effect.
 protein: blocking factor
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: blocking factor