Saeki Y, Ueno S, Mizuno R, Nishimura T, Fujimura H, Nagai Y, Yanagihara T (1994). „Molecular cloning of a novel putative G protein-coupled receptor (GPCR21) which is expressed predominantly in mouse central nervous system”. FEBS Lett. 336 (2): 317—22. PMID8262253. doi:10.1016/0014-5793(93)80828-I.
Song ZH, Modi W, Bonner TI (1996). „Molecular cloning and chromosomal localization of human genes encoding three closely related G protein-coupled receptors”. Genomics. 28 (2): 347—9. PMID8530049. doi:10.1006/geno.1995.1154.
Saeki Y, Ueno S, Mizuno R, Nishimura T, Fujimura H, Nagai Y, Yanagihara T (1994). „Molecular cloning of a novel putative G protein-coupled receptor (GPCR21) which is expressed predominantly in mouse central nervous system”. FEBS Lett. 336 (2): 317—22. PMID8262253. doi:10.1016/0014-5793(93)80828-I.
Song ZH, Modi W, Bonner TI (1996). „Molecular cloning and chromosomal localization of human genes encoding three closely related G protein-coupled receptors”. Genomics. 28 (2): 347—9. PMID8530049. doi:10.1006/geno.1995.1154.