3256
Intrathecal injections of small volumes of the alpha 2 - adrenoceptor agonists , xylazine and clonidine , into the cervical region of the spinal cord of conscious unrestrained sheep produced a dose - dependent analgesia of the forelimbs as measured using a mechanical pressure device .
 GENE: alpha 2 - adrenoceptor
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: alpha 2 - adrenoceptor