10921
Histamine transiently increased cAMP and c-fos expression through H2 receptors .
 DNA: c-fos; protein: H2 receptors
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: c-fos, H2 receptors 
Answer:
 DNA: c-fos; protein: H2 receptors