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en·keph·a·lin

n :  either of two pentapeptides with opiate and analgesic activity that occur naturally in the brain and have a marked affinity for opiate receptors  a  :  LEUCINE-ENKEPHALIN  b  :  METHIONINE-ENKEPHALIN - compare ENDORPHIN  .
 
   

 
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Arkansas Valley Regional Medical Center (La Junta, Colorado - Otero County)