https://w3id.org/framester/conceptnet5/data/en/endogeneous_opiod_peptide <https://w3id.org/framester/conceptnet5/schema/IsA> <https://w3id.org/framester/conceptnet5/data/en/peptide> <https://w3id.org/framester/conceptnet5/data/en/analgesic> risorse dalla linked data cloud