10634
The regional blockade of H1R was observed mainly in the frontal , temporal and anterior cingulate cortices , and the intravenous administration of d - chlorpheniramine as a therapeutic dose ( 2 mg ) blocked over 60 % of H1R in the frontal cortices .
 H1R, H1R
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 H1R, H1R