Assertion: viagra's substance | /r/Synonym | cyclic guanosine monophosphate
Facets:
Source sentences:
text: It works by blocking the phosphodiesterase enzyme, which normally breaks down a substance known as cyclic guanosine monophosphate (cGMP).
text: It works by blocking the phosphodiesterase enzyme, which normally breaks down a substance known as cyclic guanosine monophosphate (cGMP).