6071
RNA was extracted by phenol/chloroform and c-fos expression was analyzed by PCR assisted mRNA assay .
 RNA: RNA; DNA: c-fos
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: RNA, c-fos 
Answer:
 RNA: RNA; DNA: c-fos