27882
Melatonin offset at dawn is linked to cAMP accumulation , which directly induces transcription of the clock gene Per1 .
 Chemical: Melatonin; 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: Melatonin; Chemical: cAMP