18481
PDE4 is one of eleven known cyclic nucleotide phosphodiesterase families and plays a pivotal role in mediating hydrolytic degradation of the important cyclic nucleotide second messenger , cyclic 3 ' 5 ' adenosine monophosphate ( cAMP ) .
 Chemical: cyclic nucleotide; Chemical: cyclic nucleotide; Chemical: cyclic 3 ' 5 ' adenosine monophosphate; 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: cyclic nucleotide; Chemical: cyclic nucleotide; Chemical: cyclic 3 ' 5 ' adenosine monophosphate; Chemical: cAMP