HTR1D encodes the human gene, 5-hydroxytryptamine (serotonin) receptor 1D, G protein-coupled. It may also be known as: 5-hydroxytryptamine receptor 1D; 5-HT-1D; 5-HT1D; Serotonin 1D alpha receptor; 5-HT-1D-alpha; Serotonin receptor 1D; HT1DA; HTR1DA; HTRL; RDC4. The encoded protein has an amino acid length of 377 and a mass of 41.9 kDa. HTR1D is a member of the G-protein coupled receptor 1 family. Homologs of this gene exist in other organisms, including: Mouse, Rat, Zebrafish, Frog, Chicken.