Does anyone know of any resources that detail an extensive number of receptor types, their effects, and signalling pathways? In a similar manner to this Wikipedia page, although I am not too concerned about the localisation of the receptor, or any known ligands, as I can already access this knowledge easily. <

_From the comment section:_

The IUPHAR database is one of the most extensive database for receptors and ligands. It also contains a lot of additional information and direct references to the literature.