8803
Using the [3H]thymidine proliferation assay , we determined reactivity to purified recombinant SSB ( rSSB ) in 20 patients with SS and 19 controls .
 protein: purified recombinant SSB; protein: rSSB
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: purified recombinant SSB, rSSB 
Answer:
 protein: purified recombinant SSB; protein: rSSB