GPCR-SSFE:
A comprehensive database of G-protein-coupled receptor template predictions and homology models

neXtProt:
Exploring the universe of human proteins
TSHR
LHCGR
FSHR
GPCRDB (Hormone Receptors - Mutation data)
Information system for G protein-coupled receptors (GPCRs)

GPCR Natural Variants database
Leiden Medicinal Chemistry section of the Leiden/Amsterdam Center for Drug Research (LACDR), Leiden Institute of Advanced Computer Science (LIACS).

HGMD - Database of human gene mutation data
Intitute of Medical Genetics in Cardiff, United Kingdom

tinyGRAP mutant database

IUPHAR RECEPTOR DATABASE
International Union of Physiological Sciences, the International Union of Pharmacology

GPCR-OKB an oligomerization knowledge base

PMD - Protein Mutant Database
Center for Information Biology and DNA Databank of Japan

gpDB
Database of G-proteins and their interaction with GPCRs

Putative Orphan G Protein-Coupled Receptors