part of has part signaling receptor binding signal transduction signaling receptor activator activity receptor ligand activity https://github.com/geneontology/go-ontology/issues/14220 https://github.com/geneontology/go-ontology/issues/27076 https://github.com/geneontology/go-ontology/issues/31015 agonist The activity of a gene product that interacts with a receptor to effect a change in the activity of the receptor. Ligands may be produced by the same cell that expresses the receptor. Ligands may also be expressed at the plasma membrane of an adjacent cell (e.g. Notch ligands) or be secreted and diffuse extracellularly from their point of origin to the receiving cell (e.g. interleukins). Reactome:R-HSA-381612 molecular_function Reactome:R-HSA-8848663 signaling receptor ligand activity signaling molecule receptor agonist activity mah GO:0071884 2010-09-13T04:51:59Z GO:0048018