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Pathway Human Homo sapiens

Amine ligand-binding receptors

R-HSA-375280 in Reactome release 97: under Class A/1 (Rhodopsin-like receptors), with 42 genes placed in it by the mapping files and 5 child pathways in the hierarchy.

The same number in the other species

Reactome writes the mouse and rat events it infers from a human pathway under the human number with the species token. A door opens only where that species' own list in this release holds the id: R-MMU-375280 (mouse), R-RNO-375280 (rat). Whether the event was inferred from this one is what the record says.

01The record

Reactome's own record of this pathway

What this tells you

The pathway list, the hierarchy and the genes on this page are read from the files Reactome publishes for Reactome release 97, built into this site on 2026-09-09: the pathway list, the hierarchy relationship file and the two gene mapping files. The record card is the one live read, Reactome's own record of this pathway.

Reactome's download page describes the mapping files: Mapping files link the source database identifier to the lowest level pathway diagram or subset of the pathway, all levels of the pathway hierarchy or database identifier to all reactions. [R13] The gene list here is the all-levels mapping of NCBI Gene ids, filled from the all-levels mapping of Ensembl ids where the NCBI file has no row for a gene; each row names which file it came from by the shape of its source id. Each row carries the evidence codes the file writes for it, as written and unranked, and both where the file writes both; no page of Reactome's documentation the survey read defines the codes, so this page does not expand them. A gene id the identity files do not name is kept as the source's own id with no door rather than turned into a symbol.

On citing what a search finds, Reactome says: It should be remembered that while we strive to contain the most current and accurate data, Reactome should not be used in citations where other primary sources of information are available. [R12] The record card prints the literature Reactome attaches to a curated pathway for that reason. The data are public domain: All data in the Reactome database and files derived from that data are licensed under the Creative Commons Public Domain Dedication (CC0). User may copy, modify, and distribute these data, even for commercial purposes, without asking for permission. Attribution is encouraged but not required. [R10] The pathway illustrations are licensed apart, under CC BY 4.0, and none is shown here.

A gene on this list is one Reactome places in this pathway in this release, and that is all the row says: it does not say the gene is expressed in a tissue or associated with a disease, which are the other two explorers' questions, read from other sources. Reactome's papers of record are [R01] [R02].

  1. [R01] Ragueneau E, Gong C, Sinquin P, Sevilla C, Beavers D, Grentner A, et al. (2026). The Reactome Knowledgebase 2026. Nucleic Acids Research 54:D673-D681. PMID 41251150, doi 10.1093/nar/gkaf1223.
  2. [R02] Milacic M, Beavers D, Conley P, Gong C, Gillespie M, Griss J, et al. (2024). The Reactome Pathway Knowledgebase 2024. Nucleic Acids Research 52:D672-D678. PMID 37941124, doi 10.1093/nar/gkad1025.
  3. [R10] Reactome, reactome.org. License Agreement. https://reactome.org/license, read 2026-09-09.
  4. [R12] Reactome, reactome.org. Citing us. https://reactome.org/cite, read 2026-09-09.
  5. [R13] Reactome, reactome.org. Download. https://reactome.org/download-data, read 2026-09-09.
Reading this pathway's record from Reactome (the pathway record).Still reading. A first read of a pathway can take a while; this page waits up to 35 seconds for it, and its scripts then bring in the panel, or a line saying what did not arrive.

02The genes

Genes Reactome places in this human pathway

The mapping files place 42 genes in this human pathway; showing 1 to 42, in pages of 100, sorted by symbol for reading. The order carries no ranking.

Genes Reactome places in this human pathway, page 1 of 1
GeneADRA1AAuthorityHGNC:277Mapping file id148 NCBI fileEvidenceTAS
GeneADRA1BAuthorityHGNC:278Mapping file id147 NCBI fileEvidenceTAS
GeneADRA1DAuthorityHGNC:280Mapping file id146 NCBI fileEvidenceTAS
GeneADRA2AAuthorityHGNC:281Mapping file id150 NCBI fileEvidenceTAS
GeneADRA2BAuthorityHGNC:282Mapping file id151 NCBI fileEvidenceTAS
GeneADRA2CAuthorityHGNC:283Mapping file id152 NCBI fileEvidenceTAS
GeneADRB1AuthorityHGNC:285Mapping file id153 NCBI fileEvidenceTAS
GeneADRB2AuthorityHGNC:286Mapping file id154 NCBI fileEvidenceTAS
GeneADRB3AuthorityHGNC:288Mapping file id155 NCBI fileEvidenceTAS
GeneCHRM1AuthorityHGNC:1950Mapping file id1128 NCBI fileEvidenceTAS
GeneCHRM2AuthorityHGNC:1951Mapping file id1129 NCBI fileEvidenceTAS
GeneCHRM3AuthorityHGNC:1952Mapping file id1131 NCBI fileEvidenceTAS
GeneCHRM4AuthorityHGNC:1953Mapping file id1132 NCBI fileEvidenceTAS
GeneCHRM5AuthorityHGNC:1954Mapping file id1133 NCBI fileEvidenceTAS
GeneDRD1AuthorityHGNC:3020Mapping file id1812 NCBI fileEvidenceTAS
GeneDRD2AuthorityHGNC:3023Mapping file id1813 NCBI fileEvidenceTAS
GeneDRD3AuthorityHGNC:3024Mapping file id1814 NCBI fileEvidenceTAS
GeneDRD4AuthorityHGNC:3025Mapping file id1815 NCBI fileEvidenceTAS
GeneDRD5AuthorityHGNC:3026Mapping file id1816 NCBI fileEvidenceTAS
GeneGPR143AuthorityHGNC:20145Mapping file id4935 NCBI fileEvidenceTAS
GeneHRH1AuthorityHGNC:5182Mapping file id3269 NCBI fileEvidenceTAS
GeneHRH2AuthorityHGNC:5183Mapping file id3274 NCBI fileEvidenceTAS
GeneHRH3AuthorityHGNC:5184Mapping file id11255 NCBI fileEvidenceTAS
GeneHRH4AuthorityHGNC:17383Mapping file id59340 NCBI fileEvidenceTAS
GeneHTR1AAuthorityHGNC:5286Mapping file id3350 NCBI fileEvidenceTAS
GeneHTR1BAuthorityHGNC:5287Mapping file id3351 NCBI fileEvidenceTAS
GeneHTR1DAuthorityHGNC:5289Mapping file id3352 NCBI fileEvidenceTAS
GeneHTR1EAuthorityHGNC:5291Mapping file id3354 NCBI fileEvidenceTAS
GeneHTR1FAuthorityHGNC:5292Mapping file id3355 NCBI fileEvidenceTAS
GeneHTR2AAuthorityHGNC:5293Mapping file id3356 NCBI fileEvidenceTAS
GeneHTR2BAuthorityHGNC:5294Mapping file id3357 NCBI fileEvidenceTAS
GeneHTR2CAuthorityHGNC:5295Mapping file id3358 NCBI fileEvidenceTAS
GeneHTR4AuthorityHGNC:5299Mapping file id3360 NCBI fileEvidenceTAS
GeneHTR5AAuthorityHGNC:5300Mapping file id3361 NCBI fileEvidenceTAS
GeneHTR6AuthorityHGNC:5301Mapping file id3362 NCBI fileEvidenceTAS
GeneHTR7AuthorityHGNC:5302Mapping file id3363 NCBI fileEvidenceTAS
GeneTAAR1AuthorityHGNC:17734Mapping file id134864 NCBI fileEvidenceTAS
GeneTAAR2AuthorityHGNC:4514Mapping file id9287 NCBI fileEvidenceTAS
GeneTAAR5AuthorityHGNC:30236Mapping file id9038 NCBI fileEvidenceTAS
GeneTAAR6AuthorityHGNC:20978Mapping file id319100 NCBI fileEvidenceTAS
GeneTAAR8AuthorityHGNC:14964Mapping file id83551 NCBI fileEvidenceTAS
GeneTAAR9AuthorityHGNC:20977Mapping file id134860 NCBI fileEvidenceTAS

Evidence codes on this page: TAS, as the mapping file writes them; a row carrying two was written twice by the file, once under each. The mapping file id says which file placed the gene: an NCBI Gene id from NCBI2Reactome_All_Levels.txt, an Ensembl gene id from Ensembl2Reactome_All_Levels.txt. The two files can disagree about a code, so a row's codes are the one file's view. Measured by this site's build over this release on 2026-09-09: of the 138,908 human pathway-gene pairs both files place, 207 (0.149 per cent, over 47 genes) carry TAS in the Ensembl file where the NCBI rows carry IEA alone.

  • Reactome mapping files, the human rows for this pathway · Reactome release 97 · read · Reactome downloads"NCBI2Reactome_All_Levels.txt" and "Ensembl2Reactome_All_Levels.txt", Reactome, release 97, https://reactome.org/download-data/ (date of access 2026-09-09). Data CC0; attribution encouraged.

03The hierarchy

Parents and children in this release's hierarchy

Reactome's hierarchy is a graph rather than a tree: a pathway can sit under more than one parent, and the gene counts are each pathway's own placements at every level under it, so a parent's count is not the sum of its children's.

  • Reactome, the human pathway list and hierarchy relationship file · Reactome release 97 · read · Reactome downloads"ReactomePathways.txt" and "ReactomePathwaysRelation.txt", Reactome, release 97, https://reactome.org/download-data/ (date of access 2026-09-09). Data CC0; attribution encouraged.