molecular_function
   |__molecular transducer activity
       |__signaling receptor activity  493 rec.
           |__4-hydroxybutyrate receptor activity
           |__advanced glycation end-product receptor activity
           |__auxin receptor activity
           |__carbon dioxide receptor activity
           |__cell adhesion receptor activity 7 rec.
           |__cord factor receptor activity
           |__coreceptor activity 9 rec.
           |__corticotropin-releasing hormone receptor activity
           |__diuretic hormone receptor activity 3 rec.
           |__ethylene receptor activity
           |   |__ethylene receptor histidine kinase activity
           |__high molecular weight B cell growth factor receptor activity
           |__immune receptor activity 3 rec.
           |   |__complement receptor activity(+)
           |   |__cytokine receptor activity(+) 3 rec.
           |   |__immunoglobulin receptor activity(+)
           |   |__innate immune receptor activity
           |   |__MHC class I receptor activity(+)
           |   |__MHC class Ib receptor activity(+)
           |   |__MHC class II receptor activity
           |__leucokinin receptor activity 1 rec.
           |__neurotransmitter receptor activity 57 rec.
           |   |__benzodiazepine receptor activity
           |   |__G protein-coupled neurotransmitter receptor activity(+) 4 rec.
           |   |__postsynaptic neurotransmitter receptor activity(+) 21 rec.
           |   |__transmitter-gated channel activity(+) 42 rec.
           |__neurotrophin receptor activity 3 rec.
           |   |__brain-derived neurotrophic factor receptor activity
           |   |__nerve growth factor receptor activity
           |__nuclear receptor activity 23 rec.
           |   |__bile acid nuclear receptor activity
           |   |__nuclear steroid receptor activity(+) 4 rec.
           |__pattern recognition receptor activity 39 rec.
           |   |__lipoarabinomannan immune receptor activity
           |   |__lipopolysaccharide immune receptor activity 1 rec.
           |   |__lipoteichoic acid immune receptor activity
           |   |__peptidoglycan immune receptor activity 12 rec.
           |   |__polysaccharide immune receptor activity(+) 2 rec.
           |__peptide receptor activity 68 rec.
           |   |__G protein-coupled peptide receptor activity(+) 60 rec.
           |   |__natriuretic peptide receptor activity 1 rec.
           |   |__opioid growth factor receptor activity
           |__phorbol ester receptor activity
           |   |__non-kinase phorbol ester receptor activity
           |__photoreceptor activity 13 rec.
           |   |__blue light photoreceptor activity 1 rec.
           |   |__G protein-coupled photoreceptor activity 8 rec.
           |   |__red or far-red light photoreceptor activity(+)
           |__protein-hormone receptor activity 7 rec.
           |   |__adipokinetic hormone receptor activity 1 rec.
           |   |__anti-Mullerian hormone receptor activity
           |   |__choriogonadotropin hormone receptor activity
           |   |__follicle-stimulating hormone receptor activity
           |   |__gonadotropin-releasing hormone receptor activity
           |   |__insulin receptor activity 1 rec.
           |   |__luteinizing hormone receptor activity
           |   |__melanin-concentrating hormone receptor activity
           |   |__thyroid-stimulating hormone receptor activity
           |__thrombospondin receptor activity
           |__transmembrane signaling receptor activity 379 rec.
           |   |__acetylcholine receptor activity(+) 8 rec.
           |   |__apolipoprotein A-I receptor activity
           |   |__axon guidance receptor activity 9 rec.
           |   |__collagen receptor activity(+) 1 rec.
           |   |__complement receptor activity(+)
           |   |__cytokine receptor activity(+) 3 rec.
           |   |__cytokinin receptor activity(+)
           |   |__death receptor activity(+) 3 rec.
           |   |__G protein-coupled receptor activity(+) 134 rec.
           |   |__GABA receptor activity(+) 8 rec.
           |   |__glutamate receptor activity(+) 27 rec.
           |   |__hedgehog receptor activity 1 rec.
           |   |__ICAM-3 receptor activity
           |   |__immunoglobulin receptor activity(+)
           |   |__latrotoxin receptor activity
           |   |__mechanoreceptor activity 3 rec.
           |   |__MHC class I receptor activity(+)
           |   |__MHC class Ib receptor activity(+)
           |   |__MHC class II receptor activity
           |   |__netrin receptor activity(+) 2 rec.
           |   |__neuregulin receptor activity
           |   |__neurotensin receptor activity, non-G protein-coupled
           |   |__non-tyrosine kinase fibroblast growth factor receptor activity
           |   |__nucleotide receptor activity(+)
           |   |__olfactory receptor activity(+) 70 rec.
           |   |__opsonin receptor activity(+)
           |   |__osmosensor activity(+) 1 rec.
           |   |__phosphatidylserine receptor activity
           |   |__reelin receptor activity
           |   |__semaphorin receptor activity 3 rec.
           |   |__serotonin receptor activity(+)
           |   |__sulfonylurea receptor activity
           |   |__taste receptor activity(+) 58 rec.
           |   |__tiggrin receptor activity
           |   |__transmembrane receptor protein kinase activity(+) 26 rec.
           |   |__transmembrane receptor protein phosphatase activity(+) 8 rec.
           |   |__Wnt receptor activity 5 rec.
           |__urokinase plasminogen activator receptor activity