5178
The extracellular signal - regulated kinase ( ERK ) and the transcription factor cAMP response element - binding protein ( CREB ) were involved in neuroplastic changes associated with learning and memory .
 Chemical: cAMP
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: cAMP