3991
Prevalence of use , claims volume , and expenditures were compared for cisapride , proton pump inhibitors , histamine - 2 receptor antagonists , and the prokinetic agent metoclopramide during these periods .
 GENE: histamine - 2 receptor
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