1571
One of these, previously called B1 , is a 97-kDa protein which is secreted in large amounts and has been purified from protein-free, conditioned medium .
 protein: B1; protein: 97-kDa protein
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: B1, 97-kDa protein 
Answer:
 protein: B1; protein: 97-kDa protein