GPCR142 is an alias for the gene, Relaxin/insulin-like family peptide receptor 4, in humans. Other names include: Relaxin-3 receptor 2; G-protein coupled receptor 100; G-protein coupled receptor GPCR142; Insulin-like peptide INSL5 receptor; Relaxin family peptide receptor 4; RLN3 receptor 2; GPR100; RLN3R2; RXFPR4. The encoded protein has an amino acid length of 374 and a mass of 41.1 kDa. Other isoforms may exist. GPCR142 is a member of the G-protein coupled receptor 1 family. This gene shares homology with other species, including: Mouse.