Assertion: codeine | /r/HasProperty | selective
Facets:
value: for the mu receptor
type: TRANSITIVE-OBJECT
Source sentences:
text: Codeine is selective for the mu receptor, but with a much weaker affinity than morphine.
text: Codeine is a selective agonist for the mu opioid receptor, but with a much weaker affinity to this receptor than morphine, a more potent opioid drug.