2698
We have previously reported that CCK - 8 significantly alleviated morphine - induced amnesia and reversed spine density decreases in the CA1 region of the hippocampus in morphine - treated animals .
 Chemical: CCK - 8; Chemical: morphine; Disease: amnesia; 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; Disease: amnesia; Chemical: morphine