2699
Here , we investigated the effects of CCK - 8 on long - term potentiation ( LTP ) in the lateral perforant path ( LPP ) - granule cell synapse of rat dentate gyrus ( DG ) in acute saline or morphine - treated rats .
 Chemical: CCK - 8; Chemical: morphine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: CCK - 8; Chemical: morphine