2712
CONCLUSIONS : These results suggest that histamine - 2 receptor activation mechanisms may not be involved in postoperative IL - 6 synthesis .
 GENE: histamine - 2 receptor; GENE: IL - 6
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: histamine - 2 receptor; GENE: IL - 6