2918
Using the conflict drinking test as a model , we studied in rats the effect of the nonselective beta - adrenoceptor blockers pindolol and cyanopindolol which bind to 5 - HT1A and 5 - HT1B receptors , and of the selective beta 1 - and beta 2 - adrenoceptor antagonists betaxolol and ICI 118 , 551 , respectively , which have a negligible affinity for 5 - HT receptors .
 GENE: beta - adrenoceptor; GENE: 5 - HT1A and 5 - HT1B receptors; GENE: beta 1 - and beta 2 - adrenoceptor; GENE: 5 - HT receptors
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: beta - adrenoceptor; GENE: 5 - HT1A and 5 - HT1B receptors; GENE: beta 1 - and beta 2 - adrenoceptor; GENE: 5 - HT receptors