part_of part of part of signaling receptor binding signal transduction signaling receptor activator activity receptor ligand activity https://github.com/geneontology/go-ontology/issues/14220 receptor agonist activity vitamin D receptor activator activity Definition discussed in https://github.com/geneontology/go-ontology/issues/14220 midori signaling molecule molecular_function signaling receptor ligand activity 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, or different, cell that expresses the receptor. Ligands may diffuse extracellularly from their point of origin to the receiving cell, or remain attached to an adjacent cell surface (e.g. Notch ligands). GO:0071884 2010-09-13T04:51:59Z GO:0048018