8782
Serial sectioning of 6 micrometer was performed using a cryostat, and samples were immunohistochemically stained using the streptoavidin -biotin peroxidase method and a monoclonal antibody against c-fos.
 protein: -biotin peroxidase; protein: streptoavidin
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: -biotin peroxidase, streptoavidin 
Answer:
 protein: -biotin peroxidase; protein: streptoavidin