Assertion: ligand's receptor | /r/HasProperty | gpcrsystems
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Source sentences:
text: Since these early reports, there have been many bivalent ligands reported for various G protein-coupled receptor (GPCR) systems including cannabinoid, serotonin, oxytocin, and melanocortin receptor systems, and for GPCR-LIC systems (D2 and nACh receptors).